Narrated 'Aisha (Radi-Allahu 'anha):(the wife of the Prophet) Allah's Apostle (Sallallahu 'Alaihi Wa Sallam)said, "No calamity befalls a Muslim but that Allah expiates some of hissins because of it, even though if it were the prick he receives from athorn."Bukhari Vol. 7 : No. 544
Narrated Abu Sa'id Al-Khudri and Abu Huraira (Radi-Allahu 'anhum):
The Prophet (Sallallahu 'Alaihi Wa Sallam) said, "No fatigue, nor disease,
nor sorrow, nor sadness, nor hurt, nor distress befalls a Muslim, even if
it were the prick he receives from a thorn, but that Allah expiates some of
his sins for that."
Bukhari Vol. 7 : No. 545
Narrated Kab (Radi-Allahu 'anhu):
The Prophet (Sallallahu 'Alaihi Wa Sallam) said, "The example of a believer
is that of a fresh tender plant, which the wind bends sometimes and makes
it straight other times. And the example of a hypocrite is that of a pine
tree which keeps straight till once it is uprooted suddenly."
Bukhari Vol. 7 : No. 546