Hadith: Two groups of my Ummah Allah shall protect from the Fire: a group that invades India and a group that will be with ‘Īsa ibn Maryam (peace be upon both of them)

عن ثوبان مولى رسول الله صلى الله عليه وسلم مرفوعًا: «عِصابتان من أُمَّتي أحرزهما اللهُ من النار: عصابةٌ تغزو الهندَ، وعصابةٌ تكون مع عيسى ابن مريم عليهما السلام».
[صحيح] - [رواه النسائي وأحمد]

Thawbān, the Prophet's freed slave, reported that the Prophet (may Allah's peace and blessings be upon him) said: "Two groups of my Ummah Allah shall protect from the Fire: a group that invades India and a group that will be with ‘Īsa ibn Maryam (peace be upon both of them."
[Authentic hadith] - [An-Nasaa’i - Narrated by Ahmad]

Explanation

Two groups from the Ummah of Prophet Muhammad (may Allah's peace and blessings be upon him) will be saved from Hellfire: a group that invades the lands of India and fights the disbelievers in the cause of Allah, and a group that will be with ‘Īsa ibn Maryam when he comes down to earth at the end of the time, after the appearance of the Anti-Christ, whom ‘Īsa (peace be upon him) will kill.