بَيْنَا رَسُولُ اللَّهِ ﷺ ذَاتَ لَيْلَةٍ يُصَلِّي
“One night, while the Messenger of Allah ﷺ was praying ...”
بَيْنَا introduces an event already in progress when something else happened. ذَاتَ لَيْلَةٍ means “one night.” يُصَلِّي is an imperfect verb describing the ongoing prayer.
The sequence فَوَضَعَ، فَلَدَغَتْهُ، فَتَنَاوَلَهَا، فَقَتَلَهَا uses فَ to link consecutive actions: placing the hand down, being stung, taking hold of the scorpion, and killing it. Recognizing these connectors helps a reader follow the narrative.