the believers are only those who have faith in god and his messenger and then doubt not but strive hard with their wealth and their persons for the cause of god. such are the truthful ones.
إنما المؤمنون الذين آمنوا بالله ورسوله ثم لم يرتابوا وجاهدوا بأموالهم وأنفسهم في سبيل الله أولئك هم الصادقون