49:15 in-namal mu’minuunal-ladhiyna aamanuu bil-laahi wa rasuulihii thum-ma lam yartaabuu wa jaahaduu bi amwaalihim wa anfusihim fiy sabiylil-laah* ulaaika humuS Saadiquun

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Ahmed Raza Khan: Mohammed Aqib Qadri:
The true believers are only those who accepted faith in Allah and His Noble Messenger and then did not have any doubt, and fought with their wealth and their lives in Allah's way; it is they who are the truthful.

Yusuf Ali:
Only those are Believers who have believed in Allah and His Messenger, and have never since doubted, but have striven with their belongings and their persons in the Cause of Allah: Such are the sincere ones.

Pickthal:
The (true) believers are those only who believe in Allah and His messenger and afterward doubt not, but strive with their wealth and their lives for the cause of Allah. Such are the sincere.