A.T. Robertson Commentary Matthew 9:15

"And Jesus said unto them, Can the sons of the bridechamber mourn, as long as the bridegroom is with them? but the days will come, when the bridegroom shall be taken away from them, and then will they fast." — Matthew 9:15 (ASV)

The sons of the bride-chamber (ο υιο του νυμφωνος). It is a late Hebrew idiom for the wedding guests, "the friends of the bridegroom and all the sons of the bride-chamber" (Tos. Berak. ii. 10). Cf.John 2:29.