'First' in the Bible

The people came up from the Jordan River on the tenth day of the first month and camped at Gilgal on the eastern outskirts of Jericho.

All Israel, both foreigners and citizens, together with their elders, officers, and judges, stood on opposite sides of the Ark of the Covenant of the LORD. Half stood in front of Mount Gerizim and half stood in front of Mount Ebal, just as Moses, the LORD's servant had commanded at the first, so that they could bless the people of Israel.

The territorial allotment for the tribe of Manasseh, the firstborn of Joseph, was allocated first to Machir the firstborn of Manasseh and father of Gilead. Since he had been a man of war, Gilead and Bashan were allocated to him.

for the descendants of Aaron, one of the families of the descendants of Kohath, of the descendants of Levi, since the lot fell in their favor first.