"The Messenger of Allah (ﷺ) said: meaning: Allah Mighty and Sublime is He says: 'The Mujahid in My cause, he has guarantee fro Me. If I I seize him, I cause him to inherit Paradise, and if I return him, I return him with a reward or spoils of war.'"

This Hadith is Gharib Sahih from this route.
Jami` at-Tirmidhi Book 22, Hadith 2
← Previous Hadith "It was said, 'O Messenger of Allah, what equals Jihad?' He said: 'Verily, you (people) are not capable of it.' So they repeated it to him two or three times, each time he said, 'You (people) are not capable of it.' Then he said the third time: 'The example of the Mujahid in the path of Allah is like the one who fasts and stands (in prayer) and does not slacken from Salat, nor fasting, until the Mujahid in the cause of Allah returns.'"

There are narrations on this topic from Ash-Shifa', 'Abdullah bin Hubshi, Abu Musa', Abu Sa'eed, Umm Malik Al-Bahziyyah, and Anas.

This Hadith is a Hasan Sahih. And it has been reported through more than one route from Abu Hurairah from the Prophet (ﷺ).

Jami` at-Tirmidhi Book 22, Hadith 1 Next Hadith → That the Messenger of Allah (ﷺ) said: "The deeds of everyone who dies are sealed. Except for the one who dies guarding the frontier from the enemy, in the cause of Allah. For indeed his actions are increased for him until the Day of Judgement, and he is secure from the tribulation of the grave." And I heard the Messenger of Allah (ﷺ) saying: "The Mujahid is one who strives against his own soul."

There are narrations on this topic from 'Uqbah bin 'Amir and Jabir.

The Hadith is Fadalah is a Hasan Sahih Hadith.

Jami` at-Tirmidhi Book 22, Hadith 3