Yet whenever they see an act of a miraculous nature serving to - Surah Al-Qamar ayat 2 in Tafsir

﴿وَإِن يَرَوۡاْ ءَايَةٗ يُعۡرِضُواْ وَيَقُولُواْ سِحۡرٞ مُّسۡتَمِرّٞ ﴾
[القَمَر: 2]

Yet whenever they see an act of a miraculous nature serving to demonstrate Divine power, and omnipotence, authority and ground for belief, they look upon it as a secret and overmastering influence intended to shake their beliefs and they assert emphatically that such magic as the Messenger enchants them by, is doomed to failure and his hopes will be doomed to disappointment

﴿وإن يروا آية يعرضوا ويقولوا سحر مستمر﴾ [القَمَر: 2]

Dr Kamal Omar
And if they will witness a sign, they will avoid and will say: “(This is) sorcery which continues to occur.”

Dr Laleh Bakhtiar
And if they see a sign, they turn aside and say: Incessant sorcery

Dr Munir Munshey
When they see a clear sign, they turn away and say, "(It is) an enduring illusion

Edward Henry Palmer
But if they see a sign they turn aside and say, 'Magic, continuous

Farook Malik
Yet when they see a sign, the unbelievers turn their backs and say: "This is an ingenious magic

George Sale
But if the unbelievers see a sign, they turn aside, saying, this is a powerful charm

Maududi
(Regardless of any Signs these people see), they turn away and say: "This is an ongoing sorcery