Good deeds are often though of as those which require sacrifice and effort such as fasting and giving to charity. But one of the best deeds you can do to distance yourself from the hellfire is to hold your tongue!
Once, Mu`âdh b. Jabal asked the Prophet SAW to inform him of some good work that would admit him into Paradise and distance him from the Hellfire. The Prophet SAW mentioned to him the virtues of many good deeds, then said: “Shall I inform you of the foundation of all of that?”
Mu`âdh said: “Certainly.”
The Prophet SAW took hold of his tongue and said: “Restrain yourself from this.”
Mu`âdh then asked: “O Prophet of Allah! Are we held to task for the things that we say?”
The Prophet SAW replied: “May your mother be bereaved of you, O Mu`âdh! Does anything topple people headlong into the Hellfire save the harvests of their tongues?”
[Tirmidhî and Ibn Mâjah]
In another hadith, the Prophet SAW said:
“The Muslim is one from whose tongue and hand other Muslims are safe.”
May Allah SWT help us guard our tongues so they will not testify against us on the day of Reckoning -ameen.