What is significant about the leavened bread that could also be offered for the thanksgiving sacrifice?
Leviticus 7:13 includes that loaves of leavened bread could be presented to the Lord. This was normally excluded from the Lord’s altar (see Leviticus 2:11). By presenting both unleavened bread and leavened bread, the worshipper acknowledges the abundant goodness of the Lord.
13 With the sacrifice of his peace offerings for thanksgiving he shall bring his offering with loaves of leavened bread.