וַיֹּ֗אמֶר לֹ֤א יַעֲקֹב֙ יֵאָמֵ֥ר עוֹד֙ שִׁמְךָ֔ כִּ֖י אִם־יִשְׂרָאֵ֑ל כִּֽי־שָׂרִ֧יתָ עִם־אֱלֹהִ֛ים וְעִם־אֲנָשִׁ֖ים וַתּוּכָֽל׃
그 사람이 가로되 네 이름을 다시는 야곱이라 부를 것이 아니요 이스라엘이라 부를 것이니 이는 네가 하나님과 사람으로 더불어 겨루어 이기었음이니라
Sefer Yesodei HaTorah
After Abraham through his own understanding and in the uprightness of his heart abandoned the idols of his fathers and believed in one G-d, the L-rd chose him, revealed Himself to him, and blessed him. All this, "because he commands his children and his household after him to keep the way of the L-rd." That is, He did not choose him for himself alone, but to be the father of a holy people. And so that his seed not assimilate with the other peoples, who were idolators, He commanded him concerning circumcision, which, (at that time) was the only Divine precept in that religion. After some time, the children of Israel took upon themselves the stringency of not eating the thigh sinew in commemoration of the miracle performed for their father Jacob, at which time the honorific title of "Israel" was conferred upon him, (viz. Bereshith 32:29-33).