Tafsir of Ash-Shu`ara' 26:47

(قَالُوا آمَنَّا بِرَبِّ الْعَالَمِينَ)

It is a badal ishtimal (substitution of inclusion) for [the act of] casting, due to the connection between the mentioned casting and this utterance. Alternatively, it is a hal (circumstantial qualifier), with or without the implied [particle] qad. It is also possible that it is an explanatory resumption (isti'naf bayani), as if it were said: "What did they say?" And so it was answered: "(They said: We believe in the Lord of the worlds)."