This is to ascertain that they have delivered their Lord’s messages. He is fully aware of what they have. He has counted the numbers of all things.
لِيَعلَمَ أَن قَد أَبلَغوا رِسٰلٰتِ رَبِّهِم وَأَحاطَ بِما لَدَيهِم وَأَحصىٰ كُلَّ شَىءٍ عَدَدًا
liya’lama an qad ablaghoo risaalaati rabbihim wa ahaata bi maa ladaihim wa ahsaa kulla shai’in ‘adada