en_tn/1sa/02/34.md

in my heart and in my soul

Yahweh is telling Eli that the one he will raise up will be completely to his liking. (See: rc://en/ta/man/translate/figs-merism)

I will build him a sure house

AT: "I will ensure he always has descendants." (See: rc://en/ta/man/translate/figs-idiom)