Water from the Rock

Hear now, ye rebels, must we fetch you water out of this rock? And Moses lifted up his hand and with his rod he smote the rock once and again, and much water came out

Numbers 20:10-11, as St Cyril of Alexandria gives it

did all drink the same spiritual drink; for they drank of a spiritual Rock that followed them: and the Rock was Christ

1 Corinthians 10:4, as St John Chrysostom gives it

For it was not the nature of the rock which sent forth the water, (such is his meaning,) else would it as well have gushed out before this time: but another sort of Rock, a spiritual One, performed the whole, even Christ who was every where with them and wrought all the wonders.

John Chrysostom, Homilies on First Corinthians XXIII