Ruling of Sharing Drinks With Other People

In the Name of Allah, the Most Merciful and Compassionate

When sharing food or drink with another, one can assume the purity of their mouth. Human saliva is pure [Tahtawi/Shurunbulali, Hashiyat Maraqi al-Falah]. If you are reasonably sure that they just took an impure substance in their mouth – such as wine or pork – then avoid sharing with them.

If after taking in the impure substance one drinks water, swallows their saliva, or spits out their saliva – their mouth is again pure, and sharing a drink with them is not an issue [Tahtawi/Shurunbulali, Hashiyat Maraqi al-Falah].

The only conceivable impurities that one would ingest, despite the prohibition, are alcohol, un-slaughtered meat, pork, or even blood from within the mouth.

Mere ingesting of impermissible ingredients doesn’t entail it being impure.

Hope this helps
Allah knows best
[Shaykh] Yusuf Weltch

Checked and Approved by Shaykh Faraz Rabbani