The word(s) "strongest" appears 5 time(s) in 5 verse(s) in Quran in Mohsin Khan translation.

(1) And those who believe will say: "Are these the men (hypocrites) who swore their strongest oaths by Allah that they were with you (Muslims)?" All that they did has been in vain (because of their hypocrisy), and they have become the losers.

(2) Verily, you will find the strongest among men in enmity to the believers (Muslims) the Jews and those who are Al-Mushrikun and you will find the nearest in love to the believers (Muslims) those who say: "We are Christians." That is because amongst them are priests and monks, and they are not proud.

(3) And they swear their strongest oaths by Allah, that if there came to them a sign, they would surely believe therein. Say: "Signs are but with Allah and what will make you (Muslims) perceive that (even) if it (the sign) came, they will not believe?"

(4) And they swear by Allah their strongest oaths, that Allah will not raise up him who dies. Yes, (He will raise them up), - a promise (binding) upon Him in truth, but most of mankind know not.

(5) They swear by Allah their strongest oaths, that if only you would order them, they would leave (their homes for fighting in Allah's Cause). Say: "Swear you not; (this) obedience (of yours) is known (to be false). Verily, Allah knows well what you do."