4284 - وَ رَوَى حَمَّادُ بْنُ عِيسَى عَنْ عَبْدِ اَللَّهِ بْنِ مَيْمُونٍ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ قَالَ : "لِلْعَبْدِ أَنْ يَسْتَثْنِيَ مَا بَيْنَهُ وَ بَيْنَ أَرْبَعِينَ يَوْماً إِذَا نَسِيَ إِنَّ رَسُولَ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ أَتَاهُ نَاسٌ مِنَ اَلْيَهُودِ فَسَأَلُوهُ عَنْ أَشْيَاءَ فَقَالَ لَهُمْ "تَعَالَوْا غَداً أُحَدِّثْكُمْ" وَ لَمْ يَسْتَثْنِ فَاحْتَبَسَ جَبْرَئِيلُ عَلَيْهِ اَلسَّلاَمُ عَنْهُ أَرْبَعِينَ يَوْماً ثُمَّ أَتَاهُ فَقَالَ وَ لاٰ تَقُولَنَّ لِشَيْءٍ إِنِّي فٰاعِلٌ ذٰلِكَ غَداً إِلاّٰ أَنْ يَشٰاءَ اَللّٰهُ وَ اُذْكُرْ رَبَّكَ إِذٰا نَسِيتَ "
Hadith.4284 - Hammad ibn Isa narrated from Abdullah ibn Maymun, from Abu Abdillah 
, who said:
"A servant may make an exception (by saying 'If Allah (swt) wills') within forty days if he forgets. The Messenger of Allah (swt) (peace be upon him and his family) was visited by some Jews who asked Him ﷺ about certain matters.
He ﷺ said to them: 'Come tomorrow, and I will inform you,' but He ﷺ did not say 'If Allah (swt) wills.'
So, Archangel Jibril was delayed from coming to Him ﷺ for forty days. Then Jibril came and said:
'And do not say about anything: Surely I will do that tomorrow, except (by adding) If Allah (swt) wills. And remember your Lord (azj) when you forget.' (Surah Al-Kahf 18:23-24)"
