It appears in the hadith that Sayyidina ‘Umar radiya Llahu ‘anhu forgot an incident that occurred between him and Sayyidina ‘Ammar ibn Yasir radiya Llahu ‘anhu and that the latter had enquired from Rasulullah salla Llahu ‘alayhi wa sallam about it.
عن أبي عبد الله أن عليا عليه السلام كان مذاء فاستحيى أن يسأل رسول الله صلى الله عليه و سلم لمكان فاطمة عليها السلام فأمر المقداد أن يسأله فقال ليس بشيء
On the authority of Abu ‘Abdullah rahimahu Llah:
Sayyidina ‘Ali radiya Llahu ‘anhu would release madhi very often. And he felt ashamed to ask Rasulullah salla Llahu ‘alayhi wa sallam about it due to Sayyidah Fatimah radiya Llahu ‘anha being in his marriage. So he instructed Miqdad to ask Rasulullah salla Llahu ‘alayhi wa sallam. Rasulullah salla Llahu ‘alayhi wa sallam replied, “It is nothing.”
He has clearly mentioned the authenticity of its sanad in Kitab al Nawadir of Qutb al Din al Rawindi.
Another narration contradicts it which mentions:
It makes wudu’ compulsory.
Sayyidina ‘Umar radiya Llahu ‘anhu was aware of this verse. He also knew the manner of tayammum. However, what puzzled him is whether it included a junub (man in the state of janabah (major impurity)) or not?
Allah subhanahu wa ta ‘ala says:
وَإِنْ كُنْتُمْ مَّرْضىٰ أَوْ عَلىٰ سَفَرٍ أَوْ جَاءَ أَحَدٌ مِّنكُمْ مِّنَ الْغَائِطِ أَوْ لَامَسْتُمُ النِّسَاءَ فَلَمْ تَجِدُوْا مَاءً فَتَيَمَّمُوْا صَعِيْدًا طَيِّبًا
And if you are ill or on a journey or one of you comes from the place of relieving himself or you have contacted women and find no water, then seek clean earth.
Sayyidina ‘Umar radiya Llahu ‘anhu did not regard a junub to be included in this verse. He interpreted the contact mentioned in the verse as contact with the hand, not intercourse. Therefore, he regarded ghusl to be compulsory for a person who had intercourse.
 Tahdhib al Ahkam vol. 1 pg. 17; Wasa’il al Shia vol. 1 pg. 196 or 278; Bihar al Anwar vol. 77 pg. 225; al Hilli: Tadhkirat al Fuqaha’ vol. 1 pg. 105; Muhaqqiq al Khunsari: Mashariq al Shumus vol. 1 pg. 58; Muhaqqiq al Bahrani: al Hada’iq al Nadirah vol. 2 pg. 108.
 Kitab al Nawadir vol. 5 pg. 37. pg. 205
 Tahdhib al Ahkam vol. 1 pg. 18; Mustadrak al Wasa’il vol. 1 pg. 237.
 Surah al Nisa’: 43.Back to top