Hadith.854 - Imam Jafar ibn Muhammad Al-Sadiq (as) said:
"Whoever holds back their saliva out of reverence for Allah (swt), the Mighty and Majestic, during prayer, Allah (swt) will grant them health until their death."
Thawāb al-Aʿmāl wa ʿiqāb al-Aʿmāl #118“One who retains his saliva during Salat out of respect of Allah’s Majesty and His Honor, Allah keeps him healthy till his death.”