Numbers 19:15

19:15 And every open container that has no covering fastened on it is unclean.

Numbers 31:50

31:50 So we have brought as an offering for the Lord what each man found: gold ornaments, armlets, bracelets, signet rings, earrings, and necklaces, to make atonement for ourselves ¹  before the Lord.” ² 

[31:50]  ¹ tn Heb “our souls.”

[31:50]  ² sn The expression here may include the idea of finding protection from divine wrath, which is so common to Leviticus, but it may also be a thank offering for the fact that their lives had been spared.