1 Samuel 30:14-15

14We had attacked the south part of Judah, where the Kerethites live. We also attacked the land where the people of Caleb's clan live. We destroyed Ziklag with fire too.’

15David said to him, ‘Can you take me to find these men?’ The man said, ‘Please promise me in God's name that you will not kill me. Promise me that you will not take me back to my master. If you do that, I will lead you to find them.’