Abdur Rahman bin 'Amr al-Awza'i عبد الرحمن بن عمرو أبو عمرو الأوزاعي · The Chapters on Jihad

“When Mughirah bin Shu’bah fought alongside the Prophet (ﷺ) he would carry a spear, and when he would come back he would throw his spear down so that someone would pick it up and give it back to him.” ‘Ali said to him: “I will tell the Messenger of Allah (ﷺ) about that.” He (the Prophet (ﷺ)) said: “Do not do that, for it you do that it will not be picked up as a lost item to be returned.”

It was narrated from Jabir bin ‘Abdullah that the Prophet (ﷺ) entered Makkah on the Day of the Conquest, and his standard was white.