Leviticus 7:13
With the sacrifice of his peace offerings for thanksgiving he shall bring his offering with loaves of leavened bread.
Amos 4:5
offer a sacrifice of thanksgiving of that which is leavened, and proclaim freewill offerings, publish them; for so you love to do, O people of Israel!" declares the Lord GOD.
Leviticus 23:17
You shall bring from your dwelling places two loaves of bread to be waved, made of two tenths of an ephah. They shall be of fine flour, and they shall be baked with leaven, as firstfruits to the LORD.
Matthew 13:33
He told them another parable. "The kingdom of heaven is like leaven that a woman took and hid in three measures of flour, till it was all leavened."
1 Timothy 4:4
For everything created by God is good, and nothing is to be rejected if it is received with thanksgiving,