Genesis 32:26

And he saw that he had not power to hurt him, and he touched the hollow of his thigh, and the hollow of Jakob's thigh was distorted in his contending with him.

AND HE SAW THAT HE PREVAILED NOT AGAINST HIM. Ye angels of His, ye mighty in strength, that fulfill His word. Because of this the angel could not prevail against him to harm him for it was not permitted to him to do other than that which he did to him, namely, to disjoint the hollow of his thigh. Now the Rabbis have said in Bereshith Rabbah: “He touched all the righteous people who were destined to come from Jacob. This refers to the generation of religious persecution.” The purport of this Midrash is that this entire event constitutes a hint to his generations, indicating that there will be a generation from the seed of Jacob against whom Esau [Rome] will prevail to the extent of almost uprooting his seed. This occurred in one generation during the period of the Sages of the Mishnah, which was the generation of Rabbi Yehudah ben Baba and his companions., the Ten great Rabbis who endured martyrdom rather than abide by the Hadrianic regulations. As they said: “Rabbi Chiya bar Abba said, ‘If a person were to tell me, “Give your life for the sanctification of the Name of the Holy One, blessed be He,” I would give it, providing only that they slay me immediately. But in the generation of religious persecution I could not endure!’ And what did the Romans do in that generation? They would bring iron balls and heat them in fire and then place them under their arm-pits and cause their death.” And there are other generations in which they have done to us such things as these and even worse, but we have endured and it has passed over us, just as it is hinted in the verse, And Jacob came in peace.

כי לא יכול לו, the angel did not succeed in preventing Yaakov from crossing and fleeing.

ותקע, was dislocated, separated. We find the word as having a similar meaning in Jeremiah 6,8 פן תקע נפשי ממך; “lest My essence not become separated from you (Israel).” Whereas in the words ירך the emphasis is on the first syllable, in verse 33 in the word הירך the emphasis is on the letter ר, seeing that there it is used as a noun, whereas here it appears in an adjective mode. Whenever ירך appears in a construct form (Exodus 40,24, i.e. as something subordinate, its stress is on the first syllable) Also the kametz changes to a segol, as the word in unadorned mode is yarech and not yerech. [the author quotes parallels from the word gezel and gazel, respectively, claiming that the unadorned noun for robbery is gazel not gezel. He makes the same claim for the words geder and gader (fence) respectively. [In modern Hebrew the latter is accepted whereas “robbery,” גזל, does not appear with a kametz, but the difference between the construct mode and the unadorned noun is merely that the latter has a chataf segol instead of a regular vowel segol. Ed.]

לא יכול לו, seeing that most of Yaakov’s striving was oriented toward G’d and heavenly concerns. Both his thinking and his conversation had G’d and His will as its focus.

ויגע he informed him that in the future, i.e. כף ירכו, many of his offspring would become guilty of sins against G’d. While this troubled Yaakov he momentarily digressed from his concentration on G’d so that the angel could inflict an injury upon him during his lapse of concentration.

וירא כי לא יוכל לו, that he could not force him to the ground.