(ن) صَابَ يَصُوْبُ صَوْبًاṣāba yaṣūbu ṣawban: to come down from above, of rain, to pour.
صَيِّبٌṣayyib (adjective on the pattern of فَيْعِلٌfayʿil): a raining cloud, a heavy downpour. ﴿اَوْ كَصَيِّبٍ مِّنَ السَّمَآءِ﴾ (Al-Baqarah 2:19)
(ض) صَابَ يَصِيْبُ صَيْبًاṣāba yaṣību ṣayban: to land in the right place, to hit the mark.
صَوَابٌṣawāb (noun, ism dhāt): what is right and correct. ﴿وَقَالَ صَوَابًا﴾ (An-Nabaʾ 78:38)
Form IV (ifʿāl) اَصَابَ يُصِيْبُ اِصَابَةًaṣāba yuṣību iṣābatan: to reach the right place, to hit the mark (it is used of events and happenings, pleasant and unpleasant alike, that descend from above, since they reach precisely those persons for whom they are destined).
مُصِيْبَةٌmuṣībah (feminine active participle, ism fāʿil): a sudden calamity. ﴿مَآ اَصَابَ مِنْ مُّصِيْبَةٍ اِلَّا بِاِذْنِ اللّٰهِ﴾ (At-Taghābun 64:11)