וַיֹּאכְל֣וּ וַיִּשְׁתּ֗וּ ה֛וּא וְהָאֲנָשִׁ֥ים אֲשֶׁר־עִמּ֖וֹ וַיָּלִ֑ינוּ וַיָּק֣וּמוּ בַבֹּ֔קֶר וַיֹּ֖אמֶר שַׁלְּחֻ֥נִי לַֽאדֹנִֽי׃
Mangiarono e bevettero egli e gli uomini ch’erano con lui, e pernottarono; ed alzatisi alla dimane, disse: Lasciate ch’io vada al mio padrone.
Rashi on Genesis
וילינו AND LODGED OVER NIGHT — wherever the root לין occurs in Scripture it signifies staying for only one night.
Radak on Genesis
ויאכלו, this has been explained, i.e. now that Eliezer had explained his mission he felt free to eat the meal which had been placed before him.