Allah's Messenger (ﷺ) said, "There are three persons whom Allah will not look at on the Day of
Resurrection, nor will he purify them and theirs shall be a severe punishment. They are:
-1. A man possessed superfluous water, on a way and he withheld it from travelers.
-2. A man who gave a pledge of allegiance to a ruler and he gave it only for worldly benefits. If the
ruler gives him something he gets satisfied, and if the ruler withholds something from him, he gets
dissatisfied.
-3. And man displayed his goods for sale after the `Asr prayer and he said, 'By Allah, except Whom
None has the right to be worshipped, I have been given so much for my goods,' and somebody
believes him (and buys them).
The Prophet (ﷺ) then recited: "Verily! Those who purchase a little gain at the cost of Allah's Covenant and
their oaths." (3.77)
Sahih al-Bukhari Book 42, Hadith 7