Hadith #2333Fasting (Kitab Al-Siyam) · Narrated by Abu Ishaq al-Sabay'ai' أبو إسحاق السبيعي عمرو بن عبد الله, Ibn Umm Maktum, Muhammad bin 'Abdullah bin Numayr محمد بن عبد الله بن نمير, Sulaiman bin Hayan al-Azdi سليمان بن حيان الأزدي · Sahih
That man and the people of his city should not fast as an atonement except that they know (for certain) that the people of a certain city of Muslims had fasted on Sunday. In that case they should keep fast as an atonement.
Hadith #5207General Behavior (Kitab Al-Adab) · Narrated by Abu Bakr bin Abi Shayba أبو بكر بن أبي شيبة, Sulaiman bin Hayan al-Azdi سليمان بن حيان الأزدي, Tarayf bin Mujalad, Abu Tamayma طريف بن مجالد أبو تميمة الهجيمي · Sahih
The Companions of the prophet (ﷺ) said to the prophet (ﷺ): The people of the Book salute us. How should we reply to them? He said: say : the same to you.