Commentary
Previous verses carried a series of instructions regarding human rights. The sixth injunction appearing here is to correct a cruel custom prevailing among the people of Arabs of Jahiliyyah. During that period of time, some people used to kill their children, particularly daughters, at birth in fear of having to face the expenses on their maintenance. In the verse cited above, Allah Ta` ala has admonished them for their ignorance in assuming the responsibility of providing sustenance - who are you to do that?' This is the exclusive domain of Allah Ta’ ala. He is the One who gives you your sustenance. Now, He who gives it to you shall be the One who would give it to them as well. Why then, do you have to take the onus of killing children on yourselves because of this concern? In fact, by making the children precede as recipients of sustenance at this place, Allah Ta` ala has subtly indicated that He shall give to the children first, then give it to the parents. It really means that Allah Ta’ ala, when He sees His servant supporting his family or helping others poor and weak, He gives him liberally in proportion to enable him to meet his needs as well as help others. In a Hadith, the Holy Prophet ﷺ has been reported to have said, اِنَّمَا تُنصِرُونَ وَ تُرزَقُونَ بضُعفَایٔکُم which means: 'It is because of the poor and weak among you that you are provided by Allah with your sustenance.' This tells us that parents who support their family get, whatever they do, for the sake of weak women and children alone.
Ruling
This statement of the Qur'an also sheds light on an issue which holds the modern world in its grip. Its movers and shakers are so scared of what they call 'population explosion' that they are frantically promoting birth control and planned parent-hood. This is also based on the same false assumption that they are the ones responsible for sustenance. May be, this approach is not a sin equal in gravity to that of the killing of children, but there is no doubt about its being blameworthy.
This Ayah indicates that Allah is more compassionate towards His servants than a father to his child, because He forbids killing children just as He enjoins parents to take care of their children in matters of inheritance. The people of Jahiliyyah would not allow their daughters to inherit from them, and some would even kill their daughters lest they make them more poor. Allah forbade that and said:
(And kill not your children for fear of poverty.) meaning, lest they may make you poor in the future. This is why Allah mentions the children's provision first:
(We shall provide for them as well as for you.) In Surat Al-An`am, Allah says:
(kill not your children because of poverty.) 6:151
(We provide sustenance for you and for them) 6:151 and,
(Surely, the killing of them is a great sin.) means, a major sin. In Two Sahihs it is recorded that `Abdullah bin Mas`ud said: "I said, `O Messenger of Allah, which sin is the worst' He said,
(To appoint rivals of Allah when He has created you.) I asked, `Then what' He said, (To kill your child lest he should eat with you.) I asked, `Then what' He said, (To commit adultery with your neighbor's wife.)"