What does Genesis 26:20 mean?
God had commanded Isaac to stay in Gerar (Genesis 26:2–3), but the local king is bothered by Isaac's great wealth and prosperity (Genesis 26:14–16). To satisfy both sides, Isaac and his large estate are newly encamped in the Valley of Gerar (Genesis 26:17). If they're going to stay, it's essential they find plentiful water. The previous verse describes the discovery of a spring by Isaac's servants. Now we learn that the local herdsman claimed the rights to that water.The conflict is similar to the plot of many old western movies, in which ranchers would battle over rights to the water from the local river to grow crops or maintain sheep and cattle. Isaac, however, seems unwilling to battle over anything. His reputation as a passive man comes, in part, from his seeming refusal to fight or even challenge those who stand up to him. Instead of using his considerable power to keep the well, Isaac bows out. He names this well Esek, which means "quarrel" or "contention," and moves on to another one.
Genesis 26:6–35 describes Isaac's interactions with the Philistines while living in and around the land of Gerar. After Isaac is caught in a lie about Rebekah being his sister, king Abimelech is angry. However, he protects Isaac and Rebekah. God blesses Isaac abundantly, and his wealth grows to the point where his power provokes the king to send him away. Following a series of disputes over water rights, the king and Isaac eventually make a treaty of peace. God appears to Isaac for a second time, telling him not to fear, and renewing His promises.
Genesis 26 focuses on God's assurances to Isaac to be with him and to bless him, mostly while Isaac and his household are settled in the land of the Philistines. Just as Abraham did, Isaac fearfully lies about his wife being his sister, nearly bringing disaster on Abimelech and his kingdom. Still, God blesses Isaac with greater and greater abundance to the point that Abimelech sends Isaac away because he has become too powerful. After continued disputes over water rights, Abimelech and Isaac eventually make a covenant of peace.