11:112

"Therefore be upright as you were commanded, together with those who have repented with you." (Qur'an, Sura 11 Hud: verse 112)

from footnote # 464 of the Majestic Qur'an:

"As the Companions of the Prophet have told us, no verse made the Blessed Prophet more anxious than this. Once he said: "The surah of Hud has turned my hair gray."

pg. 234 of The Majestic Qur'an: An English Rendition of its Meanings

E-baad-e News