Every action which is not in accordance with the affair of the Prophet (صلى الله عليه وسلم) is rejected for the one who does it. As the Prophet (صلى الله عليه وسلم) has said:
من عمل عملا ليس عليه أمرنا فهو رد
“Whoever does an action which is not from this affair of ours, then it will be rejected.”
Meaning, rejected for the one who does it.
Reported by Muslim within his Sahīh (no. 1718).
Book: Ten Principles Concerning Purification of the Soul – عشر قواعد في تنمية النفس
Author: Shaykh ‘Abd al-Razzāq al-‘Abbād
Published by: Hikmah Publications
Translated by: Raha Batts