Genesis 49:6

In their counsel my soul hath not had pleasure, and in their gathering against Shekem. to destroy it mine honour was not united; for in their anger they slew the prince and his ruler, and in their ill will they demolished the wall of their adversary.

FOR IN THEIR ANGER THEY SLEW A MAN AND IN THEIR SELF-WILL THEY DISABLED AN OX (‘SHOR’). The meaning of this is that they committed violence in their wrath in that they were angry at Shechem, and it was to satisfy their own desire and not because of the guilt or sins of the slain.
Now Onkelos says that the word shor (ox) should be understood as shur (wall) with a shuruk,. Thus the word should be understood as shur (wall) rather than shor (ox). The Torah-script has no vowel signs, and for the sake of interpretation, a difficult word may sometimes be interpreted as if it were vowelled differently than the traditional reading. as in the verse, Daughters treaded on the wall (‘shur’). Thus Onkelos translated the word shor in the present verse as “the wall of the enemy,” similar in expression to the verse: Mine eye also hath gazed on them that lie in wait for me (‘b’shuroi’). The meaning of the verse is thus: “and they uprooted a city surrounded with a wall, slaying their children and women after having killed the men of the city.” The word ikru (disabled) would then be similar in use to the verse, Ekron shall be rooted up (‘tei’akeir’).
Others have explained that the ox, which is the largest of cattle, is an allusion to Hamor and his son Shechem, the prince of the country, just as in the verses: His firstling bull, majesty is his; Ye kine of Bashan, that are in the mountain of Samaria. Similarly do the verses surname the great princes “rams” is generally translated, “the mighty men of Moab,” but literally it means “the rams of Moab.” and “he-goats.” is generally translated, “the chief ones of the earth,” but literally it means “the he-goats of the earth.”
The correct interpretation appears to me to be that the verse is to be understood in its usual sense as stating that in their anger they killed each man of whom they were wrathful; and in their self-will, after their anger had been calmed by the slaying of the men, they uprooted all oxen, this being an allusion to their cattle and their possessions, including everything that was in the home and everything in the field. Now Jacob mentioned this in order to state that he had no part in all these secret deliberations of theirs, even in the removal of the cattle and possessions, or any aspect of the spoiling and plundering of the people of the city of Shechem. The word ikru [in the expression, ikru shor], has the same meaning as in the verse: Thou shalt hemstring (‘te’akeir’) their horses. But the expression and purport is all one.

בסודם אל תבא נפשי, may it be G’d’s will that I will not feature in their plots. Every time we encounter the expression אל, al, in the Torah, it is a curse, a request, or a command. It would therefore be wrong to translate this word here as meaning “I have not been part of their devious plot.”

כי באפם עקרו שור, the word עקרו here has the same meaning as the word תעקר in Joshua 11,6, where G’d promises the Israelites that they will totally disable, hamstring the horses of their enemies.

בסודם אל תבא נפשי. At the time they planned their revenge I had not been taken into their confidence either about what they were going to do or about how they were going to do it. It had not been done at my suggestion. Yaakov repeats what he said in different words, continuing אל תחד כבודי, the word תחד is in the feminine mode seeing it refers to כבוד which is another word for נפש which is a feminine noun.

כי באפם הרגו איש, the word איש refers to people generally, as in Samuel I 14,24 ואיש ישראל נגש, where it also did not refer to a single Israelite but to the Israelite troops who were pressing for action. Yaakov too describes the whole population of the city of Shechem as איש, as if a single unit. We find that the word שור is often used also as a reference to many oxen although it is in the singular mode. Other examples of such constructions are Exodus 15,19 כי בא סוס פרעה, where the Torah speaks of all of Pharaoh’s (Egypt’s) horses, not just of Pharaoh’s personal horse. Some commentators understand the words שור as meaning the ruling prince of the land, Chamor. We have several examples of someone in a high position being referred to as שור, as for instance in Deuteronomy 33,17 בכור שורו. The word עקרו in our verse, is another word for הרגו, “they killed.” The word שור may also mean “wall, fortification,” as understood by Onkelos.

וברצונם, “in order to carry out their will; their urgent desire.” In our homiletic literature, (compare Rashi) the entire line starting with אל תבא is understood as referring to misdeeds carried out by members of the tribe of Shimon in the distant future such as the leader of that tribe Zimri who slept with a Midianirte princess in an act of defiance of Jewish mores, and the infamous Korach of the tribe of Levi who wanted to usurp the position of Moses and Aaron. Due to Yaakov’s express wish here, neither of these two men had his genealogy traced all the way back to Yisrael when the Torah explains who they were. (compare Numbers 16,1 and Numbers 25,15)