“With your voice”: Ibn Abbas and Qatadah said: by your calling them to disobey Allah. Every caller to disobedience to Allah is among Iblis’s troops.
Al-Azhari said: Its meaning is: call them with a summons by which you draw them to your side—that is, lead them lightly. (1)
Mujahid said: by singing and wind instruments. (2)
“And rally against them with your cavalry and infantry”: it was said: gather your stratagems and your cavalry against them. The expressions ajlabu and jalabu are used when people raise their voices in a shout. That is: cry out with your cavalry and infantry, and spur them on through misguidance.
Muqatil said: Seek help against them through the mounted riders and foot soldiers of your troops. The cavalry are the riders, and the infantry are the foot soldiers.
The scholars of tafsir said: Every rider and pedestrian who engages in disobedience to Allah is among Iblis’s troops.
Mujahid and Qatadah said: He has cavalry and infantry from among the jinn and humankind: everyone who fights in disobedience. The terms rajul, rajjalah, and rajilah all mean the same thing. One may say rajil or rajul, just as one may say tajir or tujjar, and rakib or rukub. Hafs recited the word for “infantry” with the letter jim pronounced with a kasrah; both are dialectal variants.
“And be a partner with them in their wealth and children”: partnership in wealth includes everything acquired unlawfully or spent unlawfully. This is the view of Mujahid, al-Hasan, and Sa‘id ibn Jubayr.
Ata’ said: It is usury. Qatadah said: It is what the idolaters used to declare forbidden among livestock, such as the bahirah, sa’ibah, wasilah, and ham.
Al-Dahhak said: It is what they used to slaughter for their idols. (3)
As for partnership in children, it was narrated from Ibn Abbas that it means the infant girl buried alive.
Mujahid and al-Dahhak said: They are children born of fornication.
Al-Hasan and Qatadah said: It means that they made their children Jews, Christians, or Magians.
Another report from Ibn Abbas states that it means giving children such names as Abd al-Harith, Abd Shams, Abd al-Uzza, and Abd al-Dar, and the like. (4) 211/a