Al-Kahf 18:23 ولا تقولن لشيء اني فاعل ذالك غدا ٢٣

Saying "If Allah wills" when determining to do Something in the Future

Here Allah, may He be glorified, shows His Messenger the correct etiquette when determining to do something in the future; this should always be referred to the will of Allah, the Knower of the Unseen, Who knows what was and what