What did Jehoiada the priest set beside the altar to collect money for repairs?

Answer: A chest with a hole in its lid

Jehoiada bored a hole in the lid of a chest and set it beside the altar, where the priests put the money brought into the LORD's house.

“Then Jehoiada the priest took a chest, bored a hole in its lid, and set it beside the altar on the right side as one enters the house of the LORD. There the priests who guarded the threshold put all the money brought into the house of the LORD.”— 2 Kings 12:9 (BSB)