On judgment Day some people will come to drink from my houd, lake-fount. I will look in their faces and recognize them because they used to be Muslims during my lifetime. But just as they are about to drink 2 angels will stop them. I Muhammad will cry out: “ They are Muslims, they are of my Ummah” But the 2 angels will say to me: “You don’t know what they did after you left, they turn back on their heels as apostates from Islam.” (Sahih Bukhari Vol. 9 Hadith No. 172)