Abu Hurairah (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings of Allah be upon him) said: "The martyr feels no more pain from being killed than one of you feels from a pinch." © Imam Tirmidhi says:
This hadith is hasan sahih ghareeb.
Related hadith on this topic
Explanation & Benefits
Hafiz Muhammad Ameen
Urdu marginal note:
The joy of martyrdom and the intensity of the zeal of faith eliminate the sensation of the pain of being killed.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 3163
Maulana Ataullah Sajid
Benefit:
The aforementioned narration has been declared weak in its chain of transmission by our esteemed researcher, whereas other scholars have graded it as hasan (good).
Furthermore, the researchers of (al-Mawsu‘ah al-Hadithiyyah) have declared its chain to be strong.
For further details, see: (al-Mawsu‘ah al-Hadithiyyah, Musnad al-Imam Ahmad: 3/334/235)
and al-Sahihah of al-Albani, no. 960.
In any case, this too is a favor from Allah upon the martyr, that the process of the soul leaving the body is made easy for him, and this pain does not become unbearable for him.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 2802