م ح صm-ḥ-ṣ
(ف) مَحَصَ يَمْحَصُ مَحْصًاmaḥaṣa yamḥaṣu maḥṣan: to pick at something and separate out its impurities and unwanted parts, to purify. (This verb is not used in the Quran.)
Form II (tafʿīl) مَحَّصَ يُمَحِّصُ تَمْحِيْصًاmaḥḥaṣa yumaḥḥiṣu tamḥīṣan: to purify thoroughly, to sift and cleanse completely. ﴿وَلِيُمَحِّصَ اللّٰهُ الَّذِيْنَ اٰمَنُوْا وَيَمْحَقَ الْكٰفِرِيْنَ﴾ (Āl ʿImrān 3:141); ﴿وَلِيُمَحِّصَ مَا فِيْ قُلُوْبِكُمْ﴾ (Āl ʿImrān 3:154)