and the Last Day, let him speak good or remain silent.” Agreed upon.
This hadith states explicitly that one should not speak unless the speech is good and its benefit is clear. Whenever one is uncertain that benefit will be achieved, he should keep silent.
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Abu Musa (may Allah be pleased with him) said: I asked, “Messenger of Allah, which of the Muslims is best?” He replied, “The one from whose tongue and hand the Muslims are safe.” Agreed upon.
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Sahl ibn Saʿd reported that the Messenger of Allah ﷺ said: “Whoever guarantees for me what is between his jaws (1) and what is between his legs, I will guarantee for him Paradise.” Agreed upon.
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Abu Hurayrah (may Allah be pleased with him) heard the Prophet ﷺ say: “A servant may utter a word without considering its gravity, and because of it he will slip into the Fire farther than the distance between the east and the west.” Agreed upon.
The expression “without considering” (yatabayyanu) means: he does not reflect on whether it is good or not.
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Again Abu Hurayrah narrated that the Prophet ﷺ said: “A servant may utter a word that brings Allah’s pleasure, giving it no thought, and Allah elevates him by it many degrees; and a servant may utter a word that incurs Allah’s anger, giving it no thought, and because of it he plunges into Hell.” Reported by al-Bukhari.
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Abu ʿAbd al-Raḥmān Bilāl ibn al-Ḥārith al-Muzanī (may Allah be pleased with him) related that the Messenger of Allah ﷺ said: “A man may say a word pleasing to Allah—never imagining it would reach what it reaches—and Allah records for him His pleasure because of it until the Day he meets Him. And a man may say a word that angers Allah—never imagining it would reach what it reaches—and Allah records for him His wrath because of it until—"