Musnad Ahmad 482:161

Musa narrated to us, Ibn Lahi'ah narrated to us, from al-Harith ibn Yazid, from Ali ibn Rabah, from Uqbah ibn Amir, that the Prophet, peace and blessings of Allah be upon him, said to a man who was called Dhu al-Bijadayn: "Indeed, he is *awwah* (one who sighs much/is tender-hearted)." And that is because he was a man who frequently remembered Allah, the Almighty and Majestic, in the Quran, and he would raise his voice in supplication.