Nehemiah 9:1

The People Acknowledge Their Sin before God

9:1 On the twenty-fourth day of this same month the Israelites assembled; they were fasting and wearing sackcloth, their heads covered with dust.

Joel 2:16

2:16 Gather the people;

sanctify an assembly!

Gather the elders;

gather the children and the nursing infants.

Let the bridegroom come out from his bedroom

and the bride from her private quarters. ¹ 

¹ sn Mosaic law allowed men recently married, or about to be married, to be exempt for a year from certain duties that were normally mandatory, such as military obligation (cf. Deut 20:7; 24:5). However, Joel pictures a time of such urgency that normal expectations must give way to higher requirements.