His Fear of Ar-Riyaa

Muhammad ibn Al-Qaasim said:
 

I accompanied Muhammad ibn Aslam for more than 20 years, and I never saw him pray two supererogatory rak'ahs, except on the day of Jum'ah. On one occasion, I heard him take an oath: "By Allaah, if I was able to pray a supererogatory prayer where my two angels could not see me; I would do so out of fear of showing off". He used to enter his house and close his door. I was never aware of what he would get up to until I heard his young son conversing how he used to cry. However, when he used to go outside, he would wash his face and apply kuhl, and no sign of him crying would be visible. He used to provice for a people and clothe them, but when he would send his Messenger, he used to say: Make sure they don't know who sent you. (As-Siyar: 12/201)

Maa shaa Allaah ♥