en_tn/mat/26/20.md

he sat down to eat

Use the word for the position people in your culture usually are in when they eat.

Truly I say to you

"I tell you the truth." This adds emphasis to what Jesus says next.

Surely not I, Lord?

"I am surely not the one, am I, Lord?" Possible meanings are 1) this is a rhetorical question since the apostles were sure they would not betray Jesus. AT: "Lord, I would never betray you!" or 2) this was a sincere question since Jesus' statement probably troubled and confused them. (See: rc://en/ta/man/translate/figs-rquestion)