Inna waliyyiya Allahu allathee nazzala alkitaba wahuwa yatawalla alssaliheena
Indeed my guardian is Allah who sent down the book and He actively provides direction and guardianship to the righteous.
Here, the Aya continues after the challenge to scheme against the prophet by the idols they worship, it continues that they basically cannot do anything to harm me because I am under the protection and direction and guardianship of Allah who also actively supports and provides direction and guardianship to all the righteous people.
This provides peace and serenity to those who follow Allah’s message to the best of their knowledge and effort according to Allah’s book and his messenger’s teachings and guided by consciousness of Allah to fight their inappropriate personal biases.
Waliyyiya: my guardian
Note: the root is W-L-Y and it means direction or following direction with some guarantee. It comes close to guardianship. WALIYYIYA is either the one who is a guardian or the one who receives guardianship of another or both. In this context, guardian is the one that applies.
Allathee: the one who
Nazzala: brought down
Note: NAZZALA Is derived from the root N-Z-L and it carries the meaning of arrival to stay and descent. One concrete meaning is the descent of the person from his or her horse or camel as they arrive at the place where they plan to stay. NAZZALA is an action that is completed. It means: the action of making the object (ALKITABA= the book) arrive or making it descend happened by the subject ( third person singular pointing to Allah).
alkitaba : the book/ the documentation
Note: the root K-T-B and it means putting things together as in grouping the herd together or closing the lips or writing (the most common use), because in writing, one puts the letters and the ideas together. ALKITABA means, the process of writing or the book or anything related to it from the ideas to the ink and paper to the place where all is put together.
Wahuwa: and He
Yatawalla: provides direction and guardianship
Note: the root is W-L-Y and it means direction or following direction with some guarantee. It comes close to guardianship. WALI is either the one who is a guardian or the one who receives guardianship of another or both. YATAWALLA is an action that is being completed or will be completed. It means: the action of dirceting and providing guardianship to the object (ALSSALIHEEN= the beneficent) is happening or will be happening by the subject (third person singular).
alssaliheena: the righteous/ the beneficient
Note: ALSSALIHEENAis derived from the root Sad-L-Ha and it means becoming helpful or useful in a good direction. This means mainly: becoming one of benefit as in benefiting oneself and others. Included in this meaning is becoming fixed after having been broken. ALSSALIHEENA then here are the ones who have achieved goodness and do the deeds of goodness/ benefit and that would be the definition of the righteous.
Salaam all and have a great day.