en_tn/1sa/15/26.md

for you have rejected the word of Yahweh

Samuel made it clear that Saul understood that he was disobeying God at the time when he spared the best animals and did not kill Agag.

rejected the word of Yahweh

"rejected Yahweh's command" or "rejected Yahweh's message." This means that he refused to obey Yahweh's command. AT: "refused to obey Yahweh's command" (See: rc://en/ta/man/translate/figs-explicit)