Answer:
(Fatwa: 965/804/B=1432)
We do not find the proofs of reciting First Kalimah just after salah loudly in the books of hadith and Fiqh; hence you would better ask them why they read it.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
