This is one of the names of Allah the Exalted. The second version “a Razaaq” shows excess of this quality, that He is abundant and continuous in His provision.
Indeed, it is Allah who is the [continual] Provider, the firm possessor of strength
Surah Adh-Dhariyat (51:58)
Allah says about our provision (translation):
And in the heaven is your provision and whatever you are promised. Then by the Lord of the heaven and earth, indeed, it is truth - just as [sure as] it is that you are speaking.
Surah Adh-Dhariyat (51:21-22)
Saeed bin Jubayr as well as A Dhahaak may Allah have Mercy on them both said regarding this verse:
Provision here refers to that which descends from the sky such as water, ice and which causes growth from the earth and revives the creation.
Saeed bin Jubayr and A Dhahaak
Tafseer al Qurtubi (vol. 19 pg. 486)
“And whatever you are promised” refers to Jannah and hellfire.
Some wise people have said about the concept of provision and Allah’s emphasis that their provision comes from Him that:
Just as every person speaks for himself and it is not possible for him to speak with someone else’s tongue, likewise every person eats from his own provision and it not possible for something else to eat from his provision.
Tafseer al Bagawee (4/231)
Understanding this eliminates the un-Islamic practice of people being hostile to others who are in the same trade and removes the concept of the “hostile competitor” This is why we can observe in many Muslim countries, submission to this truth. Sellers advertise their wares on the same street, often next to one another and for the most part are content with whoever the buyer decides to purchase from. This no doubt comes from their faith and conviction that their provision has already been written by Allah.
The Messenger of Allah, peace and blessings be upon him, said:
Verily, the creation of each one of you is brought together in his mother’s womb for forty days as a drop, then he is a clot for a similar period, then a morsel for a similar period, then there is sent to him the angel who blows the spirit into him and he is commanded regarding four matters: to write down his provision, his life span, his deeds, and whether he is blessed or damned. By Allah other than whom there is no God, one of you acts like the people of Paradise until he is but an arm’s length from it, and what is written overtakes him so he acts like the people of Hellfire and he enters it. Verily, one of you acts like the people of Hellfire until he is but an arm’s length from it, and what is written overtakes him so he acts like the people of Paradise and he enters it
Abdullah ibn Masud
Sahih Bukhari (7016)
This does not mean that one does not have to go out and earn.
A man said, “O Messenger of Allah, should I tie my camel and trust in Allah, or should I leave her untied and trust in Allah?” The Prophet, peace and blessings be upon him, said, “Tie her and trust in Allah.”
Anas ibn Malik
Sunan at-Tirmidhī (2517)
Similar to this is the hadeeth which Ibn Abbas reported that combines depending on Allah while also knowing that one’s provision is decreed by Allah and cannot be taken away. He said:
I was riding behind the Messenger of Allah, peace and blessings be upon him, when he said to me, “Young man, I will teach you some words. Be mindful of Allah and he will protect you. Be mindful of Allah and you will find him before you. If you ask, ask from Allah. If you seek help, seek help from Allah. Know that if the nations gathered together to benefit you, they will not benefit you unless Allah has decreed it for you. And if the nations gathered together to harm you, they will not harm you unless Allah has decreed it for you. The pens have been lifted and the pages have dried.
Sunan at-Tirmidhī (2516)