A verse of the Holy Quran indicates the name of

1. Hazarat Muaaz (RA)
2. Hazrat Bilal (RA)
3. Hazrat Saad (RA)
4. Hazrat Zaid (RA)

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The only Companion (Sahabi) of Prophet Muhammad (PBUH) whose name is mentioned explicitly in the Holy Quran is:

Hazrat Zaid ibn Harithah (RA)

📖 Reference in the Quran:

In Surah Al-Ahzab (33:37), Allah says:

“So when Zaid had no longer any need for her, We married her to you…”
(Qur’an 33:37)

Here, Zaid is mentioned by name, making him the only companion who has this distinct honor.