Sayyiduna Fadalah bin Ubayd (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "There are three kinds of people about whom no inquiry will be made: a man who contends with Allah Almighty over His cloak, for His cloak is grandeur and His lower garment is might; a man who is in doubt about the command of Allah Almighty; and the one who despairs of His mercy."
Tabarani recorded it in this form in al-Mu'jam al-Kabir, and al-Bazzar recorded it as a longer narration, which will come later in the chapter on major sins; its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الإيمان / 360