Imam Dhahabi said about Malik ad-Dar, He (Malik ad-Dar) was a slave freed by ‘Umar bin al-Khattab, He has taken traditions from Abu Bakar as-Siddiq. [Tajrid Asma' al-Sahabah, by Imam Dhahabi, Volume 002, Page No. 44] -------- The fact that well known scholars: al-Dhahabi considered to be noble Sahaba is a proof against those contemporaries who deem Malik al-Dar to be unknown! Such Imams must have surely possessed some definitive evidence to list Malik al-Dar as a Sahabi.