Allah's Messenger (ﷺ) said, "Allah guarantees to the person who carries out Jihad for His Cause and nothing compelled him to go out but the Jihad in His Cause, and belief in His Words, that He will either admit him into Paradise or return him with his reward or the booty he has earned to his residence from where he went out." (See Hadith No. 555).
Sahih al-Bukhari Book 97, Hadith 83
← Previous Hadith While I was walking with Allah's Messenger (ﷺ) in one of the fields of Medina and he was walking leaning on a stick, he passed a group of Jews. Some of them said to the others, "Ask him (the Prophet) about the spirit." Others said, "Do not ask him." But they asked him and he stood leaning on the stick and I was standing behind him and I thought that he was being divinely inspired. Then he said, "They ask you concerning the spirit say: The spirit, its knowledge is with My Lord. And of knowledge you (O men!) have been given only a little." ...(17.85) On that some of the Jews said to the others, "Didn't we tell you not to ask?"

Sahih al-Bukhari Book 97, Hadith 82 Next Hadith → A man came to the Prophet (ﷺ) and said, "A man fights for pride and haughtiness another fights for bravery, and another fights for showing off; which of these (cases) is in Allah's Cause?" The Prophet (ﷺ) said, "The one who fights that Allah's Word (Islam) should be superior, fights in Allah's Cause." (See Hadith No. 65, Vol. 4)

Sahih al-Bukhari Book 97, Hadith 84