Q: What does Islam say about giving false evidence?
A: Giving false evidence has been mentioned as one of the seven major sins, alongside murder, drinking wine, zina etc. On Qiyamat day a flag will be planted under the buttocks of that person to tell the world that he was a liar and a cheat. This is besides the other punishment for sin in Jahannum (hell).
Mufti Siraj Desai
