Acts 12:5

5ὁIndeedμὲνthereforeοὖνPeterΠέτροςwas keptἐτηρεῖτοinἐνtheτῇprisonφυλακῇ·prayerπροσευχὴhoweverδὲwasἦνferventἐκτενῶςbeing madeγινομένηbyὑπὸtheτῆςchurchἐκκλησίαςtoπρὸςτὸνGodθεὸνconcerningπερὶhimαὐτοῦ.

Therefore indeed Peter was kept in the prison, but prayer was fervently being made to God by the church concerning him.