Reference: Taareekh Dimashq v48 p429
said:
The best [form of] jihaad is diligently performing the prayers, and the greatest [form of] ribaat (devotion) is waiting for one prayer after [another] prayer.

Reference: Taareekh Dimashq v48 p429
al-Fudhayl ibn 'Iyaadh رحمه الله said:
The best [form of] jihaad is diligently performing the prayers, and the greatest [form of] ribaat (devotion) is waiting for one prayer after [another] prayer.
Graduate of the Islaamic University of Madeenah, having completed the Arabic Language programme at the Institute of Arabic Language before progressing to the Faculty of Sharee'ah, from which he graduated in 2004.