Hisham bin Khalid bin Yazid al-Azraq هشام بن خالد بن زيد بن مروان الأزرق · Jihad (Kitab Al-Jihad)

Salamah bin Al Akwa’ said “On the day of the battle of the Khaibar, my brother fought desperately. But his sword fell back on him and killed him. The Companions of the Apostle of Allaah(ﷺ) talked about him and doubted it (his martyrdom) saying “A man who died with his own weapon”. The Apostle of Allaah(ﷺ) said “he died as a warrior striving in the path of Allaah. Ibn Shihab said “I asked the son of Salamah bin Al Akwa’.”…

The Prophet (ﷺ) said: Two (prayers) are not rejected, or seldom rejected: Prayer at the time of the call to prayer, and (the prayer) at the time of fighting, when the people grapple with each other. Musa said: Rizq ibn Sa'id ibn AbdurRahman reported from AbuHazim on the authority of Sahl ibn Sa'd from the Prophet (ﷺ) as saying: And while it is raining.