"And if you fear that you cannot act equitably towards orphans, then marry such women as seem good to you, two and three and four; but if you fear that you will not do justice (between them), then (marry) only one or what your right hands possess; this is more proper, that you may not deviate from the right course." - Quran 4:3 (read more)

"Narrated Abdullah ibn AbuDhubab: Iyas ibn Abdullah ibn AbuDhubab reported the Apostle of Allah (peace be upon him) as saying: Do not beat Allah's handmaidens, but when Umar came to the Apostle of Allah (peace be upon him) and said: Women have become emboldened towards their husbands, he (the Prophet) gave permission to beat them." - Sunan Abu Dawud 11:2141 (read more)

"It is obligatory to distribute one's zakat among eight categories of recipients (O: meaning that zakat goes to none besides them), one-eighth of the zakat to each category... The seventh category is those fighting for Allah, meaning people engaged in Islamic military operations for whom no salary has been allotted in the army roster (O: but who are volunteers for jihad without remuneration)." - Ahmad ibn Naqib al-Misri