What does Zechariah 13:9 mean?

I’ll bring that third through the fire, refining them like silver and testing them like gold. They’ll call out to me, and I’ll answer them. I’ll say, These are my people, and they’ll say, The Lord is our God. Zechariah 13:9 - Modern Text Bible

(God will purify the survivors through hardship, and they’ll come out with a real, close relationship with Him.)