The sons of Asaph, Heman and Jeduthun are 24 in number as described in 1 Chronicle 25. And lots are drawn for these sons to take their place in the order of temple maintenance and worship.
There is one common factor of all these twenty-four sons. Namely:
the third to Zakkur, his sons and relatives 12
The sons and relatives always add up to twelve! My first thought was miracle, but perhaps it is the case that no man had more than eleven sons and relatives were added so as to make twelve each time. But I don't see that mentioned anywhere in the text. I've looked at commentaries but they observed the twelve commonality, but did not explain it.
Why is the son, his sons, and his relatives always consist of twelve persons?