What they said on wearing marks in war and marking oneself to be recognised

Ibn Abi Najih (may Allah have mercy on him) said that Mujahid (may Allah have mercy on him) said concerning the statement of Allah, Lord of Might, "marked" [Al Imran: 125]: They were marked, meaning the tails of their horses were clipped and there was wool on them.

Ibn Awn (may Allah have mercy on him) said that Umayr bin Ishaq (may Allah have mercy on him) said: On the day of the Battle of Badr, it was said to the Companions (may Allah be pleased with them): "Make a mark and sign for yourselves, for the angels have marked themselves as well." He said: The first time wool was made a mark was on that day.

Harithah bin Mudarrib al-Abdi (may Allah have mercy on him) said that Sayyiduna Ali (may Allah be pleased with him) said: On the day of the Battle of Badr, the mark of the Companions of the Messenger of Allah (peace and blessings be upon him) was white wool.

Hisham bin Urwah (may Allah have mercy on him) said that Yahya bin Abbad (may Allah have mercy on him) said: On the day of the Battle of Badr, Sayyiduna al-Zubayr (may Allah be pleased with him) had a yellow turban on his head, the end of which he (may Allah be pleased with him) had wrapped around his face. Then the angels descended, and on their heads too were yellow turbans.

The above statement concerning Sayyiduna al-Zubayr (may Allah be pleased with him) is also reported through this chain.