Allah said to His Prophet,

{And let not those grieve you who rush with haste to disbelieve} 3:176.

Because the Prophet was eager for people's benefit, he would become sad when the disbelievers would resort to defiance, rebellion and stubbornness. Allah said, 'Do not be saddened by this behavior,'

for He decided with His power and wisdom that they shall not acquire any share in the Hereafter,

Allah said about the disbelievers,

by exchanging disbelief for faith,

Rather, they will only harm themselves,

Allah said next,

{And let not the disbelievers think that Our postponing their punishment is good for them. We postpone the punishment only so that they may increase in sinfulness. And for them is a disgraceful torment} 3:178.

This statement is similar to Allah's other statements,

{Do they think that because We have given them abundant wealth and children, that] We hasten unto them with good things. Nay, but they perceive not.} [23:55-56 and

{Then leave Me Alone with such as belie this Qur'an. We shall punish them gradually from directions they perceive not.} 68:44, and,

{And let not their wealth or their children amaze you. Allah's plan is to punish them with these things in this world, and that their souls shall depart (die) while they are disbelievers} 9:85,
Allah then said,

{Allah will not leave the believers in the state in which you are now, until He distinguishes the wicked from the good.} 3:179,

meaning, He allows a calamity to happen, and during this calamity His friend becomes known and His enemy exposed, the patient believer recognized and the sinful hypocrite revealed. This Ayah refers to Uhud, since Allah tested the believers in that battle, thus making known the faith, endurance, patience, firmness and obedience to Allah and His Messenger that the believers had. Allah exposed the hypocrites in their defiance, reverting from Jihad, and the treachery they committed against Allah and His Messenger. This is why Allah said,

Mujahid commented, "He distinguished between them during the day of Uhud." Qatadah said, "He distinguished between them in Jihad and Hijrah." Allah said next,

meaning, you do not have access to Allah's knowledge of His creation so that you can distinguish between the believer and the hypocrite, except by the signs of each type that Allah uncovers. Allah's statement,

{but Allah chooses of His Messengers whom He wills.} is similar to another Ayah,

{(He Alone is) the All-Knower of the Unseen, and He reveals to none His Unseen. Except to a Messenger (from mankind) whom He has chosen, and then He makes a band of watching guards (angels) to march before him and behind him.} 72:26-27. Allah then said,

Obey Allah and His Messenger and adhere to the law that he legislated for you,

The Censure of Selfishness, and Warning Against it

Allah said,

{And let not those who are stingy with that which Allah has bestowed on them of His bounty (wealth) think that it is good for them. Nay, it will be worse for them.} 3:180

Therefore, the Ayah says that the miser should not think that collecting money will benefit him. Rather, it will harm him in his religion and worldly affairs. Allah mentions the money that the miser collected on the Day of Resurrection,

Al-Bukhari recorded that Abu Hurayrah said that the Messenger of Allah said,

"Whoever Allah makes wealthy and he does not pay the Zakah due on his wealth, then (on the Day of Resurrection) his wealth will be made in the likeness of a bald-headed poisonous male snake with two black spots over the eyes. The snake will encircle his neck and bite his cheeks and proclaim, 'I am your wealth, I am your treasure.'"

The Prophet then recited the Ayah,
{And let not those who are stingy with that which Allah has bestowed on them of His bounty think that it is good for them. Nay, it will be worse for them},

until the end. Al-Bukhari, but not Muslim, collected this Hadith using this chain of narration, Ibn Hibban also collected it in his Sahih.

Imam Ahmad recorded that 'Abdullah said that the Prophet said,

"Every person who does not pay the Zakah due on his wealth, will have his money made into the shape of a bald-headed, poisonous male snake who will follow him. The person will run away from the snake, who will follow him and proclaim, 'I am your treasure!'"

'Abdullah then recited the Ayah in Allah's Book that testifies to this fact,

This was recorded by At-Tirmidhi, An-Nasa'i, and Ibn Majah, and At-Tirmidhi said, "Hasan Sahih."

Allah's statement,

means,

{and spend of that whereof He has made you trustees} 57:7.

Therefore, since all affairs are under Allah's control, then spend from your money so it will benefit you on the Day of Return,

with your intentions and what your hearts conceal.