וַיְהִ֡י כַּאֲשֶׁר֩ רָאָ֨ה יַעֲקֹ֜ב אֶת־רָחֵ֗ל בַּת־לָבָן֙ אֲחִ֣י אִמּ֔וֹ וְאֶת־צֹ֥אן לָבָ֖ן אֲחִ֣י אִמּ֑וֹ וַיִּגַּ֣שׁ יַעֲקֹ֗ב וַיָּ֤גֶל אֶת־הָאֶ֙בֶן֙ מֵעַל֙ פִּ֣י הַבְּאֵ֔ר וַיַּ֕שְׁקְ אֶת־צֹ֥אן לָבָ֖ן אֲחִ֥י אִמּֽוֹ׃
And it came to pass, when Jacob saw Rachel the daughter of Laban his mother’s brother, and the sheep of Laban his mother’s brother, that Jacob went near, and rolled the stone from the well’s mouth, and watered the flock of Laban his mother’s brother.
Rashi on Genesis
ויגש יעקב ויגל JACOB STEPPED NEAR AND ROLLED [THE STONE]- as easily as one draws the stopper from the mouth of a bottle — thus showing you how strong he was. (Bereishit Rabbah 70:12)
Rashbam on Genesis
ויגל את האבן, seeing he was a son of her father’s sister.
Sforno on Genesis
כאשר ראה יעקב את רחל, until he had met Rachel Yaakov had not been interested to get involved in the problem of rolling the rock off the top of the well. He had been afraid that if he helped the three shepherds would only be concerned with watering their own flocks without waiting around to assist any other shepherds.