"Should I not be a thankful servant?"

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When Aisha ra. saw the Prophet saw. praying for so long that his feet became swollen, she said to him:

"O Messenger of Allah, why do you undergo so much hardship despite the fact that Allah has pardoned for you your earlier and later sins?"

He responded:

"Afala akuna abdan shakura?" - “Should I not be a thankful servant?”

Sahih Bukhari