Nahj al-Balagha Hadith n. 39

Selections from The Sayings and Preaching of Amir al-Muminin Ali ibn Abi Talib (Peace Be Upon Him) Including His Replies to Questions and Maxims Expressed for Various Purposes.
Translated by Sayyid Ali Reza

وَقَالَ (عليه‏ السلام):

Amir al-mu'minin, peace be upon him, said:

لاَ قُرْبَةَ بِالنَّوَافِلِ

Supererogatory worship cannot bring about nearness to Allah

إِذَا أَضَرَّتْ بِالْفَرَائِضِ

if it hampers the obligatory.