en_tn/1sa/17/45.md

in the name of Yahweh

Here "name" represents God's power or authority. Alternate translation: "with the power of Yahweh" or "with the authority of Yahweh" (See: rc://en/ta/man/translate/figs-metonymy)

whom you have defied

"whom you have provoked" or "whom you have insulted"