Miriam, Moses’ sister, and Aaron, Moses’ spokesman started badmouthing Moses’ choice for a wife. They went on to question what was so special about Moses that the Lord would want to speak through him. The Lord overheard their conversation and immediately put a stop to it.
Aaron confessed their wrong to Moses. Moses forgave them. 
Satan will try to throw wrenches in the relationships that mean the most to us. He will try anything to put a division between God’s people. Extend the same forgiveness that you would want offered to you. Move on without holding grudges. 
Scripture taken from:

Numbers 12:1-13