Exodus 29:30
The son who succeeds him as priest and enters the Tent of Meeting to minister in the Holy Place must wear them for seven days.
Berean Standard Bible
And that son that is priest in his stead shall put them on seven days, when he cometh into the tabernacle of the congregation to minister in the holy place.
Seven days shall the son who is priest in his place put them on, when he comes into the Tent of Meeting to minister in the holy place.