(37) باب إِبَاحَةِ الأَخْذِ لِمَنْ أُعْطِيَ مِنْ غَيْرِ مَسْأَلَةٍ وَلاَ إِشْرَافٍ
This hadith has been narrated by Abdullah b. al-Sa'di from 'Umar b. al-Khattab who heard it from the Messenger of Allah (ﷺ).
Reference: Sahih Muslim 1045 c
In-book reference: Book 12, Hadith 144
USC-MSA web (English) reference(deprecated numbering scheme): Book 5, Hadith 2274