(س) صَحِبَ يَصْحَبُ صُحْبَةًṣaḥiba yaṣḥabu ṣuḥbatan: to stay with someone, to be a companion.
صَاحِبٌṣāḥib pl. اَصْحَابٌaṣḥāb (active participle, ism fāʿil): one who keeps company, companion. ﴿اِذْ يَقُوْلُ لِصَاحِبِهِۦ لَا تَحْزَنْ﴾ (At-Tawbah 9:40); ﴿اُولٰٓئِكَ اَصْحٰبُ الْجَنَّةِ﴾ (Al-Baqarah 2:82)
صَاحِبَةٌṣāḥibah (feminine): female companion, wife. ﴿مَا اتَّخَذَ صَاحِبَةً وَّلَا وَلَدًا﴾ (Al-Jinn 72:3)
Form IV (ifʿāl) اَصْحَبَ يُصْحِبُ اِصْحَابًاaṣḥaba yuṣḥibu iṣḥāban: to let someone keep company, to support. ﴿وَلَا هُمْ مِّنَّا يُصْحَبُوْنَ﴾ (Al-Anbiyāʾ 21:43)
Form III (mufāʿalah) صَاحَبَ يُصَاحِبُ مُصَاحَبَةًṣāḥaba yuṣāḥibu muṣāḥabatan: to keep company with one another, to live together. ﴿وَصَاحِبْهُمَا فِي الدُّنْيَا مَعْرُوْفًا﴾ (Luqmān 31:15)