My father رحمه الله said, it was narrated to us by Moḥammed bin Yaḥya, from Moḥammed bin Aḥmed, from al-Sindi ibn Kardūs:

From Abī ʿAbd Allāh عليه السلام, who said: Whoever purifies himself, then retires himself to his bed; he spends the night as if his bed is his mosque.

أبي (ره) قال حدثني محمد بن يحيى عن محمد بن أحمد عن السندي ابن ربعة عن محمد بن كردوس عن أبي عبد الله عليه السلام قال من تطهر ثم آوى إلى فراشه بات وفراشه كمسجده