﴿ إِنَّا كُنَّا مِن قَبْلُ نَدْعُوهُ ۖ إِنَّهُۥ هُوَ ٱلْبَرُّ ٱلرَّحِيمُ ﴾

“Verily, we did invoke Him [alone] ere this: [and now He has shown us] that He alone is truly benign, a true dispenser of grace!””

indeed before that is in the world we used to call on Him worship Him affirming His Oneness. Verily He is read innahu as the beginning of a new independent sentence even if it introduces the reason in terms of its import; or read annahu as a reason in terms of the syntactical order of the words the Benign the Beneficent the True to His promise the Merciful One of tremendous mercy.