What was the relationship between Moses and Elijah?
Moses and Elijah were both at Horeb, the mountain of God. Both appeared with Jesus at the Transfiguration. Exodus 3:1; 1 Kings 19:8; Matthew 17:3
What the Bible says
Matthew 17:3
And behold there appeared to them Moses and Elias talking with him.
Douay-Rheims Bible (Challoner revision), public domain.
Did you know?
A note in the NAB compares what Elijah experienced at Horeb with what Moses experienced there. NAB note on 1 Re 19, 11-13