Question Summary:
The virtues of reciting Surat Taubah ayat 128 – 129

Question Detail:

I want to know the benefits of reciting surat taubah ayat 128 - 129 and how to read it properly like how many times and after which prayers in ablution or without also .

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
The verses in reference are;
لَقَدْ جَاءَكُمْ رَسُولٌ مِنْ أَنْفُسِكُمْ عَزِيزٌ عَلَيْهِ مَا عَنِتُّمْ حَرِيصٌ عَلَيْكُمْ بِالْمُؤْمِنِينَ رَءُوفٌ رَحِيمٌ (128) فَإِنْ تَوَلَّوْا فَقُلْ حَسْبِيَ اللَّهُ لَا إِلَهَ إِلَّا هُوَ عَلَيْهِ تَوَكَّلْتُ وَهُوَ رَبُّ الْعَرْشِ الْعَظِيمِ (129) } [التوبة: 128، 129] 
Translation:
Undoubtedly a Rasool (Messenger) from yourselves has come to you (someone whose linage, morals, manners and integrity you know well). The difficulties that afflicted you are very distressing to him. He is anxious for (good to come to) you and extremely forgiving and merciful (gentle and kind) towards the Mu`mineen. (128)
If they turn away, then say, “Allah is sufficient for me (even if the whole world turns against me). There is none worthy of worship but Him. On Him only do I rely and he is the Rabb of the glorious Throne.” (I therefore do not fear you if you turn against me. However, you have to worry about your own condition if you refuse to accept imaan. ) (129)
 
The verses highlight the lofty position of Rasulallah (sallalahu alayhi wa sallam) and his sublime qualities of love and compassion. While there are virtues in merely reciting some verses of the Quran, the Quran is actually a means of guidance. We should ponder upon the contents of the verses and endeavour to emulate Prophet (sallalahu alayhi wa sallam) in inculcating in us love, softness and care.
Nevertheless Rasulallah (sallalahu alayhi wa sallam) has said; the one who continuously reads  the verses in reference will not face a death through destruction, drowning, (being) burnt or being hurt by an object[1]. 
Abu Darda (radiyallahu anhu) narrates: if anyone recites seven times in the morning and evening;
حسبيَ اللهُ، لا إله إلا هو عليهِ توكلّتُ، وهو ربُّ العرشِ العظيمُ
 “Allah is sufficient for me, there is no god but he (Allah), on him is my trust, he is the Lord of the Throne of Glory”, Allah will be sufficient for him against anything which grieves him[2].
It is advisable to recite these verses in the state of wudhu. However being in the state of wudhu is not necessary.
And Allah Ta’āla Knows Best
Hafizurrahman Fatehmahomed
Student Darul Iftaa
Netherlands
Checked and Approved by,
Mufti Ebrahim Desai.