וַיֹּ֥אמֶר לָבָ֖ן הֵ֑ן ל֖וּ יְהִ֥י כִדְבָרֶֽךָ׃
האָט לָבָן געזאָגט: יאָ, זאָל זײַן אַזױ װי דײַן װאָרט.
Sforno
לו יהי כדברך, so that you will be satisfied with the results of your own proposal. [Lavan assumed that Yaakov had shot himself in the leg with his proposal. Ed.]
Siftei Chakhamim
A term indicating acceptance of terms. [Rashi is explaining that here it is] not like הן לי לא נתת זרע (15:3), which means הנה (behold).
Rav Hirsch
צוטריטלעך נאָר פֿאַר פּרעמיום־מיטגלידערRashi
לו יהי כדברך I WOULD IT MIGHT BE ACCORDING TO THY WORD — Would that you will remain satisfied with this!