Laughing is spoken of as if their mouths were a container and their laughter was in it. It can be made clear that this laughter was a response to their joy. Alternate translation: "we laughed for joy" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-explicit]])
The verbs "were filled" can be stated clearly. Singing is spoken of as if their tongues were containers and singing was in them. Alternate translation: "our tongues were filled with singing" or "we sang songs of joy" (See: [[rc://en/ta/man/translate/figs-ellipsis]] and [[rc://en/ta/man/translate/figs-metaphor]])