Thikr in a certain manner not reported in Sunnah is an innovation
21-3-2013 | IslamWeb
Question:
Assalamu alaikum. I would like to thank you for accepting my mail. My name is isma'il.I am a nigerian. Here in nigeria we have a lot of muslims that are well learned in the quran. I have been given lots of thikrs and du'as by different people. For eg "waman yattaqillaha yaj'allahu' till the end of the verse ,1000 times. For fullfillment of need from ALLAH. Then there is "hasbunallahu wa ni'mal wakil" 450 times for protection. Suratil falaq & suratil nas 101 times each for protection against evil and black magic. These are only a few of what I have been given. My question is, is it okay to go ahead with these ? Or is it considered bidi'a ? Even though its all in the quran,but the prophet didn't do these.
Answer:
All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
Although such forms of Thikr (remembrance of Allaah) and Du‘aa' (supplication to Allaah) are originally stated in the Noble Quran, they were not reported, in the way you stated, neither from the Messenger of Allaah, sallallaahu ‘alayhi wa sallam, nor from his Companions 
determining a specific number to be recited when a Muslim individual needs something in order to achieve a specific aim such as curing an illness, protection from the evil eye or envy, or the like.
Hence, such ways are not permissible and actually included in what our scholars called Bid‘ah Idhaafiyyah (additional or secondary innovation, i.e. an act of worship whose basis is permitted but it contradicts the Sharee’ah regarding its reason, type, amount, manner, time or place). This meaning was explained in the Fatwa 167169, so you may refer to it.
Allaah Knows best.