Takhrij Hadith 1828: "I came to the Prophet…"

I came to the Prophet (peace and blessings be upon him), and he said: "Are you asking me, or shall I tell you?" I said: "Tell me." He said: "You have come to ask me about the vastness of Allah's mercy, so let me tell you that Allah, Exalted is He, says: 'I have never become angry with anyone the way I become angry with a servant who commits a sin and then regards it as too great to be within reach of My pardon. Had I been quick to punish, or had haste been My way, I would have hastened [punishment] for those who despair of My mercy. And if I did not show mercy to My servants except for their fear of standing before Me, I would have rewarded them for that, and made their reward for it security from what they feared.'"