'Expound' in the Bible

East of the Jordan River, in the land of Moab, Moses began to expound this Law:

I will raise up a prophet like you from among their relatives, and I will place my words in his mouth so that he may expound everything that I have commanded to them.

And he said unto them, Out of the eater came forth meat, and out of the strong came forth sweetness. And they could not in three days expound the riddle.

I will focus my attention on a proverb; I will use the harp to expound my riddle.