4 occurrences across the corpus

King James Version

Exodus 2:3

And when she could not longer hide him, she took for him an ark of bulrushes, and daubed it with slime and with pitch, and put the child therein; and she laid it in the flags by the rivers brink.

Exodus 2:5

And the daughter of Pharaoh came down to wash herself at the river; and her maidens walked along by the rivers side; and when she saw the ark among the flags, she sent her maid to fetch it.

Isaiah 19:6

And they shall turn the rivers far away; and the brooks of defence shall be emptied and dried up: the reeds and flags shall wither.

Jubilees

Jubilees 47:4

And thy mother hid thee for three months, and they told regarding her. And she made an ark for thee, and covered it with pitch and asphalt, and placed it in the flags on the bank of the river, and she placed thee in it seven days, and thy mother came by night and suckled thee, and by day