Rashi on Genesis 32:18/רש"י על בראשית ל״ב:י״ח

1למי אתה means TO WHOM DO YOU BELONG, implying who has sent thee? The Targum should be דמאן את “of whom are you” and not למאן את as some editions have.

2ולמי אלה לפניך means and these which are before you whose are they; i.e. to whom is this present being sent? The letter ל is used as a prefix in place of של “belonging to”; e.g., (31:43) “and all that thou seest is mine (לי)” i.e. belongs to me; (Psalms 24:1) “The earth is the Lord’s (לה') and the fullness thereof” i.e. belongs to the Lord.