This can be translated in active form. You may need to make explicit which house they completed. AT: "They completed God's house" or "They finished building the temple" (See: [[rc://en/ta/man/translate/figs-activepassive]] and [[rc://en/ta/man/translate/figs-explicit]])
"Adar" is the name of the twelfth and last month of the Hebrew calendar. It is during the cold season. The third day is near the middle of February on Western calendars. (See: [[rc://en/ta/man/translate/translate-hebrewmonths]] and [[rc://en/ta/man/translate/translate-names]] and [[rc://en/ta/man/translate/translate-ordinal]])