﴿ سُنَّةَ ٱللَّهِ ٱلَّتِى قَدْ خَلَتْ مِن قَبْلُ ۖ وَلَن تَجِدَ لِسُنَّةِ ٱللَّهِ تَبْدِيلًۭا ﴾

“such being God’s way which has ever obtained in the past - and never wilt thou find any change in God’s way!”

That is the way of God sunnata’Llāhi is a verbal noun emphasising the import of the preceding sentence about the defeat of the disbelievers and the victory of the believers that is to say sanna’Llāhu dhālika sunnatan ‘God has established this as His way of dealing with believers and disbelievers’ which has taken its course before and you will never find in God’s way any change by Him.