(5) باب الأَمْرِ بِإِخْرَاجِ زَكَاةِ الْفِطْرِ قَبْلَ الصَّلاَةِ
Ibn 'Umar reported that the Messenger of Allah (ﷺ) ordered that the Sadaqat-ul-Fitr should be paid before the people go out for prayer.
Reference: Sahih Muslim 986 a
In-book reference: Book 12, Hadith 26
USC-MSA web (English) reference(deprecated numbering scheme): Book 5, Hadith 2159