Al-Kāfi
Hadith 173811ـ وَبِإِسْنَادِهِ قَالَ فِيمَا نَاجَى الله بِهِ مُوسَى (عَلَيهِ السَّلام) قَالَ يَا مُوسَى لا تَنْسَنِي عَلَى كُلِّ حَالٍ فَإِنَّ نِسْيَانِي يُمِيتُ الْقَلْبَ.
11. Through the same chain of narrators (it is narrated from Abu ‘Abdillah (a.s.) who has said the following): “Abu ‘Abd Allah (a.s.) has said, ‘Of the words of Allah to Moses was that He said, “O Moses do not forget Me in any condition; forgetting Me deadens a heart.”’