From Sahih Bukhari (Hadith 4018):
Narrated Anas bin Malik:Some men of the Ansar requested Allah's Messenger (ﷺ) to allow them to see him, they said, "Allow us to forgive the ransom of our sister's son, `Abbas." The Prophet (ﷺ) said, "By Allah, you will not leave a single Dirham of it
Reference: Bukhari 4018