And those listed were 23,000, every male from a month old and upward. For they were not listed among the people of Israel, because there was no inheritance given to them among the people of Israel.
Levi was God's tribe, exempt from the land-lot and the war-muster, so the Levites escaped the curse that barred all others numbered at Sinai from entering Canaan. Yet their increase was paltry, only 1000 more, making them still one of the smallest tribes. Their losses to divine judgment were a lesson to all Israel.
AI summary
Commenting on Numbers 26:57-62
twenty and three thousand--so that there was an increase of a thousand (Num 3:39). males from a month old and upward--(See on Num 3:14).
Num 26:62 The Levites were not mustered along with the rest of the tribes of Israel, because the mustering took place with especial reference to the conquest of Canaan, and the Levites were not to receive any territory as a tribe (see at Num 18:20).