And singing hymns
Κατὰ δὲ τὸ μεσονύκτιον Παῦλος καὶ Σιλᾶς προσευχόμενοι ὕμνουν τὸν Θεόν, ἐπηκροῶντο δὲ αὐτῶν οἱ δέσμιοι·
The author of Acts indicated that about midnight (Κατὰ δὲ τὸ μεσονύκτιον), Paul (Παῦλος) and Silas (καὶ Σιλᾶς) were praying (προσευχόμενοι) and singing hymns (ὕμνουν) to God (τὸν Θεόν). The other prisoners (οἱ δέσμιοι) were listening (ἐπηκροῶντο) to them (δὲ αὐτῶν). Acts was the only Greek biblical writing that used this word ἐπηκροῶντο, that means to listen attentively or to hear. Around midnight, Paul and Silas were praying and singing hymns to God, while the other prisoners were listening. Maybe some of them were also praying or singing. Would you pray or sing hymns if you were in prison?