Fleeing from Jezebel, where did Elijah leave his servant?

Answer: Beersheba

Elijah ran for his life to Beersheba in Judah, left his servant there and went a day's journey into the wilderness.

“And Elijah was afraid and ran for his life. When he came to Beersheba in Judah, he left his servant there, while he himself went a day’s journey into the wilderness. He sat down under a broom tree and prayed that he might die. “I have had enough, LORD,” he said. “Take my life, for I am no better than my fathers.””— 1 Kings 19:3-4 (BSB)