My father رحمه الله said, it was narrated to us by ʿAbd Allāh bin Jaʿfar al-Ḥumairi, from al-Sindi, from Moḥammed bin Sinān, from Ṭalḥa bin Zaid, from Jaʿfar bin Moḥammed, from his father عليهما السلام, who said:

The Messenger of Allāh صلى الله عليه وآله said: Whoever swallows his saliva out of respect for the rights of the mosque, Allāh makes his saliva a source of good health for his body, and a cure from affliction in his flesh.

أبي (ره) قال حدثنا عبد الله بن جعفر الحميري عن السندي عن محمد بن سنان عن طلحة بن زيد عن جعفر بن محمد عن أبيه عليهما السلام قال: قال رسول الله صلى الله عليه وآله من رد ريقه تعظيما لحق المسجد جعل الله ريقه صحة في بدنه وعوفي من بلوى في جسده