en_tn/gen/26/30.md

Isaac made a feast for them, and they ate and drank

Eating a meal together was a part of making a covenant with one another. (See: rc://en/ta/man/jit/figs-explicit)

for them

Here "them" refers to "Abimelech, Ahuzzath, and Phicol"

they ate

Here "they" refers to Isaac, Abimelech, Ahuzzath, and Phicol. Alternate translation: "they all ate"