comes from their saying: "Lahintu" (لَحِنْتُ), meaning: I made it clear; and "Alhantu al-rajula falahina" (أَلْحَنْتُ الرجلَ فَلَحِنَ), meaning: I made him understand, and he understood.
"And Allah knows your deeds" before you perform them.
من قَوْلهم: لَحِنْتُ أَي: بيَّنتُ، وأَلْحَنْتُ الرجلَ فَلَحِنَ؛ أَي: فهَّمتُه ففهم.
﴿وَالله يعلم أَعمالكُم﴾ من قبل أَن تعملوا.
