This excerpt is taken from the book by Sheikh Abi Abdul Saboor Abdul Ghafoor Damni Fazail al-Jihad.
Even if after becoming a Muslim, one only gets the opportunity to perform Jihad and no other deed, success in the Hereafter is guaranteed
عن أبى اسحاق قال سمعت البراء رضى الله عنه يقول أتي النبى صلى الله عليه وسلم رجل مقنع بالحديد فقال يا رسول الله أقاتل أو أسلم قال أسلم ثم قاتل فأسلم ثم قاتل فقتل فقال رسول الله صلى الله عليه وسلم عمل قليلا وأجر كثيرا.
"Abu Ishaq narrates that he heard from Bara bin Azib (may Allah be pleased with him) who said: A man wearing armor came to the Prophet Muhammad (peace be upon him) and said: 'O Messenger of Allah! Should I participate in the battle first or embrace Islam first?' The Prophet (peace be upon him) said: 'Embrace Islam first, then participate in the battlefield.' So he embraced Islam first, then participated in the battle, and after that he was martyred in the battle. The Messenger of Allah (peace be upon him) said: 'He did little action but gained great reward.'"
Reference: (Sahih Bukhari and Muslim) (Narrated by Bukhari, Book of Jihad and Expedition, Chapter: Righteous Deeds before Fighting, wording as given, Number: 2808 / Muslim, Book of Leadership, Chapter: Affirmation of Paradise for the Martyr, Number: 1900)
Explanation
From this hadith, it is understood that being a Muslim is a prerequisite for the acceptance of every good deed. If a non-Muslim performs a good deed, they are rewarded for it in this world, but they will have nothing in the Hereafter.
It is also understood from this hadith that if a person sincerely accepts Islam and then does not get the opportunity to perform good deeds, even the obligatory acts, their reward becomes obligatory with Allah.
