Muhammad bin Abdullah bin Numayr narrates that Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) died during the caliphate of Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) in the year 22 AH.

Khalifah bin Khayyat narrates that Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) died during the caliphate of Sayyiduna Uthman (may Allah be pleased with him) in the year 32 AH. This disagreement about the time of the death of Ubayy bin Ka'b is evident.

Mus'ab bin Abdullah narrates that Sayyiduna Ubayy bin Ka'b bin Qays bin Ubayd bin Zayd bin Mu'awiyah bin Amr bin Malik bin al-Najjar died during the caliphate of Sayyiduna Uthman (may Allah be pleased with him). The hair of his head and beard was white. There are different views about (the year of) his death: 29 AH, 22 AH and 30 AH. It is mentioned that his kunya was Abu al-Tufayl, meaning he had two kunyas. He died in Madinah at a time when strife and criticism against Sayyiduna Uthman (may Allah be pleased with him) had appeared.

Zirr bin Hubaysh narrates that there was some sharpness and harshness in the temperament of Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him).