en_tn/1sa/28/20.md

he had eaten no food all that day, neither that whole night

Saul had not eaten during the night before he traveled from Gilboa (1 Samuel 28:4) to Endor (1 Samuel 28:7), nor during the day as he journeyed, nor during the night on which he visited the woman.

I have put my life in my hand and have listened

This is an idiom. "I could die because I listened" or "Someone could kill me because I listened" (See: rc://en/ta/man/translate/figs-idiom)