Charles Ellicott Commentary Jeremiah 41:1

"Now it came to pass in the seventh month, that Ishmael the son of Nethaniah, the son of Elishama, of the seed royal and [one of] the chief officers of the king, and ten men with him, came unto Gedaliah the son of Ahikam to Mizpah; and there they did eat bread together in Mizpah." — Jeremiah 41:1 (ASV)

It came to pass in the seventh month. —It stands to reason that the visit was intended to be one of courtesy and recognition. The remaining representatives of the house of David (Jeremiah 40:8) would show that they were ready to welcome the new Satrap. As the seventh month included the Feast of Tabernacles, it is quite likely that they came as if to share in its festivities. Three months had passed since the capture of the city (Jeremiah 39:2).