Amr bin Awf (r.a.)
Hz. Amr became a Muslim during the first years of Islam. He migrated to Madinah like the other Companions. He took part in the Battle of Khandaq. He fought heroically there. He wanted to participate in the Battle of Tabuk but he could not attend because he could not afford to prepare for the expedition. At that time, there was financial difficulty in Madinah. Even the Companions who were rich had difficulties in preparing for this battle.
Hz. Amr went to the Prophet with a few Companions who did not have enough money like him. They said that they did not want to be deprived of the thawab of this jihad and asked him to help them. However, the Prophet did not have anything to give them. These Companions left by crying. Thereupon, verse 92 of the chapter of at-Tawba was sent down. The verse is as follows:
"Nor (is there blame) on those who came to thee to be provided with mount, and when thou saidst "I can find no mounts for you," they turned back, their eyes streaming with tears of grief that they had no resources wherewith to provide the expenses."
Hz. Amr, who narrated a few hadiths from the Prophet, died during the caliphate of Muawiya.
One of the hadiths he narrated is as follows:
“Whoever revives a Sunnah from my Sunnah which died after me, for him is a reward similar to whoever acts upon it without diminishing anything from their rewards. And whoever introduces an erroneous innovation which Allah is not pleased with, nor His Messenger, then he shall receive sins similar to whoever acts upon it, without that diminishing anything from the sins of the people.” 
Isaba, 3: 9; Usdul-Ghaba, 4: 124; Ibn Majah, Muqaddimq: 15; Tirmidhi, Ilm: 16.