Tanach · Rishonim on Tanach · Ibn Ezra · Torah

Ibn Ezra on Leviticus 10:1/אבן עזרא על ויקרא י׳:א׳

אאיש מחתתו. כל איש לקח מחתתו ולפי דעתי שזה הדבר היה גם ביום השמיני והעד הן היום הקריבו את חטאתם:
1EACH OF THEM HIS CENSER.1 (literally, a man his censer). Each man took his firepan.2 is to be interpreted as if written kol ish machtato (each man his censer). Our verse literally reads, And…the sons of Aaron took a man his censer. Hence I.E.’s comment that our verse is to be interpreted, And…the sons of Aaron took each man his firepan. I believe that this event also took place on the eighth day.3 Behold, this day have they offered their sin-offering (v. 19)4 is proof of this.
בויתנו בהן אש. לא מהאש שיצאה וזה טעם אש זרה:
2AND PUT FIRE THEREIN. Not from the fire that came forth from the Lord.5 This is the meaning of strange fire.
גוטעם אשר לא צוה אותם. שמדעתם עשו ולא בצווי להקטיר קטורת גם באש זרה:
3[WHICH HE HAD NOT COMMANDED THEM.] They acted on their own and were not commanded to burn incense and certainly not to employ a strange fire.