Rocks: Often Composed of Flint
Source: TTT
Deuteronomy 8:15
He led you through the vast and terrifying wilderness with its venomous snakes and scorpions, a thirsty and waterless land. He brought you water from the rock of flint.
Deuteronomy 32:13
He made him ride on the heights of the land and fed him the produce of the field. He nourished him with honey from the rock and oil from the flinty crag,