This excerpt is taken from Sheikh Abu Hamza Abdul Khaliq Siddiqi's book Sahi Fazail-e-Amaal.
Allah Almighty says:
﴿وَمَن يَخْرُجْ مِن بَيْتِهِ مُهَاجِرًا إِلَى اللَّهِ وَرَسُولِهِ ثُمَّ يُدْرِكْهُ الْمَوْتُ فَقَدْ وَقَعَ أَجْرُهُ عَلَى اللَّهِ ۗ وَكَانَ اللَّهُ غَفُورًا رَّحِيمًا﴾
"And whoever emigrates for the cause of Allah and His Messenger and then death overtakes him, his reward has already become incumbent upon Allah. And Allah is ever Forgiving and Merciful."
Reference: (4-An-Nisa:100)
Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates that once a man was standing by the Messenger of Allah (peace be upon him) on a mount, when he fell from his mount, broke his neck, and died. The Messenger of Allah (peace be upon him) said: "Give him a bath with water and leaves of berry, and shroud him in those two cloths. Do not cover his head nor apply perfume to him. On the Day of Resurrection, he will rise saying the Talbiyah (لبيك اللهم لبيك)."
Reference: Sahih Bukhari, Book of Funerals, No: 1267 - Sahih Muslim, Book of Hajj, No: 1206/93.