And so it was, when God helped the Levites who bore the ark of the covenant of the LORD, that they offered seven bulls and seven rams.
1 Chronicles 15:26
Surrounding context
15:25 So David, the elders of Israel, and the captains over thousands went to bring up the ark of the covenant of the LORD from the house of Obed-Edom with joy.
15:26 And so it was, when God helped the Levites who bore the ark of the covenant of the LORD, that they offered seven bulls and seven rams.
15:27 David was clothed with a robe of fine linen, as were all the Levites who bore the ark, the singers, and Chenaniah the music master with the singers. David also wore a linen ephod.