As a remembrancer, it would help them recall and apply correctly what had been explained.
فَقُبَيْلَ مَوْتِهِ قَالَ لِرُسُلِهِ :‏ « اَلْمُعِينُ ،‏ ٱلرُّوحُ ٱلْقُدُسُ ،‏ ٱلَّذِي سَيُرْسِلُهُ ٱلْآبُ بِٱسْمِي ،‏ .‏ .‏ .‏