Book of Joel Chapter 2 Vs. 16

Return to the Lord 

Gather the people, sanctify the congregation, assemble the elders, gather the children, and those that suck the breasts: let the bridegroom go forth of his chamber, and the bride out of her closet. Joel 2:16

Gather the people... The entire worshiping community (assembly) was to gather, from the oldest (elders) to the youngest (those nursing at the breast). Not even newlyweds were exempted (cf. Deut. 24:5). From oldest to youngest they were to come. The situation is so grave that even the groom and bride were exhorted to assemble (Deut. 24:5); consummation of the marriage could wait.

Sanctify the congregation... At this gathering, there would be no excuses accepted. Everyone must repent. Even the babies and little children must come, and be set aside for God's purpose.

Again, The entire worshiping community (assembly) was to gather, from the oldest (elders) to the youngest (those nursing at the breast). Not even newlyweds were exempted (cf. Deut. 24:5).