Sahih Al Bukhari – Book of Good Manners And Form (Al-Adab)
Volumn 008, Book 073, Hadith Number 146.
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Narated By Anas bin Malik : The Prophet said, "Make things easy for the people, and do not make it difficult for them, and make them calm (with glad tidings) and do not repulse (them)."
Junaid Tahir