The active participle refers to the seller: بَائِعٌ. The passive participle refers to what is sold: مَبِيعٌ.
FormActive participlePassive participle
Masculine singularبَائِعٌمَبِيعٌ
Masculine dualبَائِعَانِمَبِيعَانِ
Masculine pluralبَائِعُونَمَبِيعُونَ
Feminine singularبَائِعَةٌمَبِيعَةٌ
Feminine dualبَائِعَتَانِمَبِيعَتَانِ
Feminine pluralبَائِعَاتٌمَبِيعَاتٌ
These nominal forms follow six number-and-gender positions; do not confuse them with the fourteen-person verbal paradigm.