That is, the moon when it comes together and becomes complete and full. These statements refer to its light in the white days (the days when the sky has bleached) on the night of the thirteenth, fourteenth and fifteenth of the Hijri month when the moon completes its cycle.

AL-Hassan AL-Bassri (may Allah be pleased with him) said: اتَّسَقَ refers to the moon when it lights and this happens when it is circular as the full sun’s light reflects on it.