'When a man makes a promise with the intention of fulfilling it, but for some valid reason is unable to do so, he does not thereby commit a sin.'
HADITH OF ABU DAWUD
On the Authority of Zayd Ibn Arqam
The Hadith (الحديث, pl. Ahadith) is a body of laws, legends and stories about Muhammad's way of life, (Arabic, Sunnah which includes his biography or the sira) and the sayings themselves where he elaborated on his choices or offered advice; many parts of the Hadith deal with his companions (Sahaba).