Question Summary:
Praying to Allah in one’s mind

Question Detail:

If i pray to allah in mind in salat Assalamu alikum.is it will cause any harm to my salat if i pray to allah in mind in salat ?

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
 
When you perform salaat by yourself, you must read so loudly that at least you can hear yourself. If you read only in your mind, the salaat will be invalid.[1]
 
And Allah Ta’āla Knows Best
Muhammad Haris Siddiqui
Student Darul Iftaa
Melbourne, Australia 
Checked and Approved by,
Mufti Ebrahim Desai.