Psalm 110:1: "Sit at My right hand until I make Your enemies…"

Answer: a footstool for Your feet

"The LORD said to my Lord: 'Sit at My right hand until I make Your enemies a footstool for Your feet.'"

“A Psalm of David. The LORD said to my Lord: “Sit at My right hand until I make Your enemies a footstool for Your feet.””— Psalm 110:1 (BSB)