"There is no contractual obligation after four (days)."
Sunan Ibn Majah Book 12, Hadith 109
← Previous Hadith "The contractual obligation regarding a slave lasts for three days." (1)

Sunan Ibn Majah Book 12, Hadith 108 Next Hadith → "I heard the Messenger of Allah (ﷺ) say: 'The Muslim is the brother of another Muslim, and it is not permissible for a Muslim to sell his brother goods in which there is a defect, without pointing that out to him."'

Sunan Ibn Majah Book 12, Hadith 110