94th Ayah from Surah An Nisa
Sahih International
O you who have believed, when you go forth [to fight] in the cause of Allah, investigate; and do not say to one who gives you [a greeting of] peace "You are not a believer," aspiring for the goods of worldly life; for with Allah are many acquisitions. You [yourselves] were like that before; then Allah conferred His favor upon you, so investigate. Indeed Allah is ever, with what you do, Acquainted.
Abdul Haleem
So, you who believe, be careful when you go to fight in God’s way, and do not say to someone who offers you a greeting of peace, ‘You are not a believer,’ out of desire for the chance gains of this life- God has plenty of gains for you. You yourself were in the same position [once], but God was gracious to you, so be careful: God is fully aware of what you do.
Mohsin Khan/Hilali
O you who believe! When you go (to fight) in the Cause of Allah, verify (the truth), and say not to anyone who greets you (by embracing Islam): "You are not a believer"; seeking the perishable goods of the worldly life. There are much more profits and booties with Allah. Even as he is now, so were you yourselves before till Allah conferred on you His Favours (i.e. guided you to Islam), therefore, be cautious in discrimination. Allah is Ever Well-Aware of what you do.
Taqi Usmani
O you who believe, when you go out in the way of Allah, be careful, and do not say to the one who offers you the Salām (salutation), “You are not a believer” to seek stuff of the worldly life. So, with Allah there are spoils in abundance. In the same state you were before; then Allah favored you. So, be careful. Surely, Allah is All-Aware of what you do.
Pickthall
O ye who believe! When ye go forth (to fight) in the way of Allah, be careful to discriminate, and say not unto one who offereth you peace: "Thou art not a believer," seeking the chance profits of this life (so that ye may despoil him). With Allah are plenteous spoils. Even thus (as he now is) were ye before; but Allah hath since then been gracious unto you. Therefore take care to discriminate. Allah is ever Informed of what ye do.
Pickthall
O ye who believe! When ye go abroad in the cause of Allah, investigate carefully, and say not to any one who offers you a salutation: "Thou art none of a believer!" Coveting the perishable goods of this life: with Allah are profits and spoils abundant. Even thus were ye yourselves before, till Allah conferred on you His favours: Therefore carefully investigate. For Allah is well aware of all that ye do.