عَنِ ابْنِ عُمَرَ رضي الله عنهما، قَالَ: قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم: لَو عَلِمْتُمْ قَدْرَ رَحْمَةِ اللَّهِ لَاتَّكَلْتُمْ وَمَا عَمِلْتُمْ مِنْ عَمَلٍ وَلَوْ عَلِمْتُمْ قَدْرَ غَضَبِهِ مَا نَفَعَكُمْ شَيْءٌ
Ibn Umar narrated that the Messenger of Allah said: ‘Were you to have an idea about the vastness of Allah’s mercy, you’d sit down relying upon Allah and wouldn’t engage in any act. And were you to have an idea about the vastness of Allah’s anger, you’d believe that no good deed of yours will benefit you.’
—Husn Adh-Dhann of Ibn Abi Ad-Dunya 64, Silsilah As-Sahihah 2167; Hasan