The idiom "the word of Yahweh came to" is used to introduce a special message from God. AT: "Yahweh gave a message to Samuel. He said," or "Yahweh spoke this message to Samuel:" (See: [[rc://en/ta/man/translate/figs-idiom]])
Saul not obeying Yahweh is spoken of as if Saul had physically turned away from walking behind God. AT: "he has stopped following me" (See: [[rc://en/ta/man/translate/figs-metaphor]])
# has not performed my commandments
"has not obeyed what I commanded him to do." Saul was to completely destroy everything and everyone. God had placed a ban on the Amalekites. But Saul permitted some livestock to live.
# Samuel was angry
Possible meanings are 1) Samuel was angry with Saul for his disobedience or 2) Samuel was disturbed.