A reading from Psalms 137:9

Happy {shall he be}, that taketh and dasheth thy little ones against the stones. {the stones: Heb. the rock}

— Psalms 137:9 (en_kjv)
https://peck.to/tx/ea28c6361cfe3f816210b1b5cf956c15f04df9f5abe0b144496e90acb241a794

Dashed against the rock.