Musnad Abu Ya'la al-Mawsili 160:199

And with his chain of narration, he said: The Messenger of Allah (ﷺ) said: "Follow the right course, seek to be near [to perfection], and receive glad tidings. Seek help through the early morning, the late afternoon, and a portion of the night. And upon you is moderation, [so that] you may reach [your goal]. And know that there is not one among you whom his deeds will save." We said: "Not even you, O Messenger of Allah?" He said: "Not even me, unless Allah, the Mighty and Majestic, covers me with mercy and favor from Him."