Sahih Bukhari
Saying Something under Compulsion (Ikraah)
Volume: 009 / Book Number: 085 / Hadith Number: 83
Narrated 'Abdullah bin 'Umar:
Allah's Apostle said, "A Muslim is a brother of another Muslim. So he should neither oppress him nor hand him over to an oppressor. And whoever fulfilled the needs of his brother, Allah will fulfill his needs."