In the third month they began building up the heaps, and they finished in the seventh month.
We have here an account of what was done after the passover. What was wanting in the solemnities of preparation for it before was made up in that which is better, a due improvement of it after. When the religious exercises of a Lord's day or a communion are finished we must not think that then the work is done.
Commenting on 2 Chronicles 31:1-10
In the third month they began to lay the foundation of the heaps..... The month Sivan, as the Targum, in which month was the feast of Pentecost, called the feast of the harvest, Exo 23:16, for then barley harvest was ended, and wheat harvest began, and the firstfruits were brought: and finished them in the seventh month; the month Tisri, as the Targum, in which...
In the third month - "The month Sivan; the seventh, Tisri." - Targum. The heaps - The vast collections of grain which they had from the tithes over and above their own consumption; see Ch2 31:10.