16. sanctify the congregation—namely, by expiatory rites and purification with water [Calvin], (Ex 19:10, 22). Maurer translates, "appoint a solemn assembly," which would be a tautological repetition of Joe 2:15.
elders … children—No age was to be excepted (2Ch 20:13).
bridegroom—ordinarily exempted from public duties (De 24:5; compare 1Co 7:5, 29).
closet—or, nuptial bed, from a Hebrew root "to cover," referring to the canopy over it.