What does all the leaven mean?

Jesus warns to beware of the leaven of the Pharisees and of Herod.
When Jesus broke the five loaves for the five thousand, there were twelve baskets left over. Based on Matt 13:54, Jesus was near his hometown of Nazareth, among the Israelites, His own people. There were twelve baskets left over to correspond to the 12 tribes of Israel. The leaven of the Pharisees would be hypocrisy and dead religion. The Israelites should beware of dead religion that does not lead to God.
The seven loaves were broken for the four thousand somewhere around the district of Tyre and Sidon, among the foreigners. The seven baskets represent the seven nations that were driven out of the promised land before the Israelites could take possession of it. Deut. 7:1 says, "When the Lord your God brings you into the land that you are entering to take possession of it, and clears away many nations before you, the Hittites, the Girgashites, the Amorites, the Canaanites, the Perizzites, the Hivites, and the Jebusites, seven nations more numerous and mightier than yourselves." The leaven of Herod would be the lure of the world. Herod had literally just had John the Baptist beheaded because he didn't want to look bad in front of his guests and because of the physical pleasure of watching the dancing girl. These sound like the lures of the world to me.

Created over 3 years ago