Synagogues: Probably Originated in the Schools of the Prophets
Source: TTT
1 Samuel 19:18–24
So David ran away and escaped. And he went to Samuel at Ramah and told him all that Saul had done to him. Then he and Samuel went to Naioth and stayed there. / When Saul was told that David was at Naioth in Ramah, / he sent messengers to capture him. But when they saw the group of prophets prophesying, with Samuel leading them, the Spirit of God came upon them, and Saul’s messengers also began to prophesy.
2 Kings 4:23
“Why would you go to him today?” he replied. “It is not a New Moon or a Sabbath.” “Everything is all right,” she said.