Ref. No. 41/999
In the name of Allah the most gracious the most merciful
The answer to your question is as follows:
Laa ilaaha Illallah or only Illallah zikr is allowed in shariah? In “Imdadul Fatawa Jadeed” 11/314, Hazrat Tahnvi (ra) has written that it is permissible.
And Allah knows best
Darul Ifta
Darul Uloom Waqf Deoband