Updated: Nov 20
The word Mubahala arises from the root word - Bahala - which means to curse. Mubahala would mean, 'mutual cursing'. In the year 632 CE, Prophet Muhammad (peace be upon him), his daughter Fatima, her husband Ali, and their two sons Hassan and Hussein participated in a theological debate with Najrani Christians about the human nature of Jesus (alayhi salam). The Quran says this about the human nature of Isa/Jesus.
Indeed, the example of Jesus to Allāh is like that of Adam. He created him from dust; then He said to him, "Be," and he was. [3:59]
The truth is from your Lord, so do not be among the doubters. [3:60]
Then whoever argues with you about it after [this] knowledge has come to you - say, "Come, let us call our sons and your sons, our women, and your women, ourselves and yourselves, then supplicate earnestly [together] and invoke the curse of Allāh upon the liars [among us]."[3:61]
Indeed, this is the true narration. And there is no deity except Allāh. And indeed, Allāh is the Exalted in Might, the Wise. [3:62]
Prophet Muhammad (pbuh) upon noticing that the discussion was not going anywhere invited the Christians to a meeting where both parties would say their piece about who Christ was. Islam regards Isa as a Prophet while Christians have twisted the truth, due to the false teachings of the false apostle Paul, to say that Jesus is God. The followers of Muhammad (pbuh) and the Najrani Christians would then invoke the curse of God on those who were lying.
However, the Christians never turned up. They negotiated a peace treaty. So, the Mubahala - the mutual cursing never happened.
However, I see an opportunity for Muslims/believers to do a Mubahala in the current events surrounding the Palestinian Genocide.
Everywhere in-person or online, the Zionists have created a smearing campaign. A person will usually find either the Israeli Hasbara or the Christian Zionists spewing false narratives about why innocent Palestinians are being/need to be killed. Some of these arguments will become so convoluted that the believer already knows there is a web of lies but finds it impossible to get their word across.
My suggestion is - to conclude the discussion and invoke Ayah 3:61. Invoke the curse of Allah upon the liars in that particular discussion and say A'meen. End the discussion and INVOKE Allah to bring Allah's wrath upon the liars in that discussion. Ask the opposing party to join in the prayer but they won't - so then just the believers in that group invoke the curse of Allah.
May the truth come out and may falsehood perish. A'meen.