Al-Kāfi
Hadith 8163- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ وَمُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ جَمِيعاً عَنِ ابْنِ مَحْبُوبٍ عَنِ ابْنِ رِئَابٍ عَنْ حَمْزَةَ بْنِ حُمْرَانَ قَالَ سَأَلْتُ أَبَا عَبْدِ اللهِ (عَلَيْهِ السَّلام) عَنْ قَوْلِ اللهِ عَزَّ وَجَلَّ وَاذْكُرْ رَبَّكَ إِذا نَسِيتَ قَالَ ذَلِكَ فِي الْيَمِينِ إِذَا قُلْتَ وَاللهِ لا أَفْعَلُ كَذَا وَكَذَا فَإِذَا ذَكَرْتَ أَنَّكَ لَمْ تَسْتَثْنِ فَقُلْ إِنْ شَاءَ اللهُ.
3. A number of our people have narrated from Sahl ibn Ziyad and Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad all from ibn Mahbub from ibn Ri’ab from Hamzah ibn Humran who has narrated the following: “I once asked abu ‘Abd Allah (a.s.), about the meaning of the words of Allah, most Majestic, most Glorious, ‘. . . speak of your Lord if you forget.’ He (the Imam) said, ‘It is in taking oath when you say, ‘By Allah, I will not do so and so and when you remember that you have forgotten to make an exception then say, ‘if Allah so wills.’”