וַיֹּ֣אמֶר שַׁלְּחֵ֔נִי כִּ֥י עָלָ֖ה הַשָּׁ֑חַר וַיֹּ֙אמֶר֙ לֹ֣א אֲשַֽׁלֵּחֲךָ֔ כִּ֖י אִם־בֵּרַכְתָּֽנִי׃
And he said: ‘Let me go, for the day breaketh.’ And he said: ‘I will not let thee go, except thou bless me.’
Rashi on Genesis
כי עלה השחר FOR THE DAY BREAKETH, and I have to sing God’s praise at day (Chullin 91b; Genesis Rabbah 78:1).
Rashbam on Genesis
כי עלה השחר, seeing that it is daylight already it is time for you to be on your way. (to the meeting with Esau).
Sforno on Genesis
לא אשלחך, this utterance by Yaakov confirms what the sages tell us that the righteous are greater than the ministering angels (Sanhedrin 92).