Mustadrak al-Hakim — Hadith 141

It is narrated from Sayyiduna Alqamah bin Waqqas (may Allah be pleased with him) that a man of standing passed by him while he was in the market of Madinah and greeted him. Alqamah said to him: "O so-and-so! You have ties of kinship (with us) and a right as well, and I see that you go to these rulers and speak before them whatever Allah wills you to speak. Yet I heard Sayyiduna Bilal bin al-Harith al-Muzani (may Allah be pleased with him), the Companion of the Messenger of Allah (peace and blessings be upon him), saying that the Messenger of Allah (peace and blessings be upon him) said: 'Indeed, one of you speaks a word pleasing to Allah which he does not even imagine will reach so far, and because of it Allah records His good pleasure for him until the day he meets Him. And one of you speaks a word displeasing to Allah which he does not imagine will reach so far, and because of it Allah records His displeasure against him until the day he meets Him.'" Alqamah said (advising him): "Woe to you! Look at what you are saying and what you speak about, for many a time what I heard from Bilal bin al-Harith has prevented me from speaking (much)."
Imam Malik bin Anas abridged the narration of this hadith from Muhammad bin Amr and did not mention Alqamah bin Waqqas.