Divrey Hayamim Bais 15:10

10 So they gathered themselves together at Yerushalayim in the chodesh hashelishi, in the fifteenth year of the reign of Asa.

Divrey Hayamim Bais 15:10 Meaning and Commentary

2 Chronicles 15:10

So they gathered themselves together at Jerusalem
By the order of Asa, ( 2 Chronicles 15:9 ) ,

in the third month;
of the ecclesiastical year, the month Sivan, in which month was the day of Pentecost; and that very probably was the time of their gathering:

in the fifteenth year of the reign of Asa;
and which seems to be the year in which he fought the Ethiopians.

Divrey Hayamim Bais 15:10 In-Context

8 And when Asa heard these words, and the nevu’ah of Oded HaNavi, he took courage, and put away the shikkutzim (abominable idols) from kol Eretz Yehudah and Binyamin, and from the cities which he had captured from Mt Ephrayim, and renewed the Mizbe’ach Hashem, that was in front of the Ulam Hashem.

9 And he gathered all Yehudah and Binyamin, and the gerim with them from Ephrayim and Menasheh, and from Shim’on, for they fell to him from Yisroel in abundance, when they saw that Hashem Elohav was with him.

10 So they gathered themselves together at Yerushalayim in the chodesh hashelishi, in the fifteenth year of the reign of Asa.

11 And they offered unto Hashem on that day, of the plunder which they had brought back, 700 bakar and 7000 tzon.

12 And they entered into the Brit to seek Hashem Elohei Avoteihem with all their lev and with all their nefesh;