Except [when adding], "If Allah wills." And remember your Lord when you (18:24)

Almuntakhab Fi Tafsir Alquran Alkarim

That is if it be the will of Allah. And should you forget this divine axiom, then call Allah to mind and invoke Him to guide you to a better choice than that which you had in mind I pray and beseech You O Allah, my Creator, to guide me to a better choice than that which I had in mind

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(18:24) except that Allah wills it." If ever you inadvertently utter anything like this, you should at once remember your Lord and say, "I hope that my Lord will guide me *24 in this matter with that thing which is nearest to the right way for me"

Except [when adding], "If Allah wills." And remember your Lord when you meaning

*24) This is a parenthetical clause which has been inserted here because of its relevancy to the preceding verse, in which it was asserted that the correct number of the Sleepers of the Cave is known only to Allah and a research into it is a useless task. Therefore one should refrain from investigating into unimportant things, nor enter into discussions about them. This has led to the instruction contained in the parenthetical clause for the benefit of the Holy Prophet and the Believers who have been told never to make a positive assertion like this: "L will do this thing tomorrow", for you do not know whether you will be able to do that thing or not: you have neither the knowledge of the unknown nor have full powers to do what you like. If ever inadvertently you utter anything like this, you should at once remember your Lord and say, "lnsha Allah." Besides this you do not know whether there will be any good for you in the thing about which you say, "1 will do this." It is possible that you may do another thing better than that. Therefore you should trust in God and say, "I hope that my Lord will guide me in this matter with that thing which is nearer to the right way for me."
 

Except [when adding], "If Allah wills." And remember your Lord when you meaning in Urdu

(تم کچھ نہیں کر سکتے) اِلّا یہ کہ اللہ چاہے اگر بھولے سے ایسی بات زبان سے نکل جائے تو فوراً اپنے رب کو یاد کرو اور کہو "امید ہے کہ میرا رب اِس معاملے میں رشد سے قریب تر بات کی طرف میری رہنمائی فرما دے گا"