'Ark of the Lord' in the Bible

And David gathered all Israel together to Jerusalem, to bring up the ark of the LORD unto his place, which he had prepared for it.

And said unto them, Ye are the chief of the fathers of the Levites: sanctify yourselves, both ye and your brethren, that ye may bring up the ark of the LORD God of Israel unto the place that I have prepared for it.

So the priests and the Levites sanctified themselves to bring up the ark of the LORD God of Israel.

And he appointed certain of the Levites to minister before the ark of the LORD, and to record, and to thank and praise the LORD God of Israel: