بِسۡمِ ٱللَّهِ مَجۡرٜىٰهَا وَمُرۡسَىٰهَآۚ إِنَّ رَبِّي لَغَفُورٞ رَّحِيمٞ.

In the name of Allah is its course and its anchorage. Indeed, my Lord is Forgiving and Merciful.

Bismi llahi majraha wamursaha inna rabbi laghafurun rahim

Prophet Nuh prays that the ark runs its course and anchors in the Name of Allah so that Allah protects those aboard by protecting the ark at all times. Commentators point out that it was appropriate for Prophet Nuh to choose the attributes All-Forgiving and Especially Merciful at a time when everyone except those saved on the ark would perish. Hence, this is an affirmation that it is mankind who stubbornly chooses evil, misguidance, and to reject faith, and that Allah is All-Forgiving and Merciful to those who accept the Truth that is made plain to them. -Ibn Katheer and others.