From the root r-z-q which has the following classical Arabic connotations:
The root r-z-q points to the idea of the receiving of anything beneficial, particularly a gift, whereby something is nourished, sustained, or helped to grow physically, mentally or spiritually.
The Rizq (provision) of Allah (Glory be to Him) will not be brought by the carefulness of the miser, nor will it be prevented by the hostility of one who does not want it to come to another. It is part of the Wisdom of Allah (Glory be to Him) that He differentiates between His slaves in their provision just as He differentiates between them in their physical creation and their attitudes. So He gives in abundance to whomever He wills and gives little to whomever He wills. He may give plenty to some people and little to others. He is the One Who guarantees the provision of His slaves according to His prior knowledge and decree. Allah (Glory be to Him) knows and decrees that some of His slaves will be given plenty and some will be given little; He has reasons for that that are beyond our comprehension. In His wisdom, He gives plenty or gives little as a test for His slaves, testing them with blessings or with calamities.
Allah (Glory be to Him) is al-Razzaaq (the Provider) and the best of those who give provision, as said in Qur’an, “And no moving (living) creature is there on earth but its provision is due from Allah” Qur’an.Surah Hud 11:6
The reason why Allah (Glory be to Him) provides some people with abundance and others are afflicted with miserly is because this world is a place of test. Allah (Glory be to Him) tests by providing, not providing or by taking away. A Muslim is supposed to be patient and thankful to Allah (Glory be to Him) in all situations because a Believer never loses hope in Allah (Glory be to Him).
Allah (Glory be to Him) says, interpretation of the meaning: “Do men think that they will be left alone on saying “We believe” and that they will not be tested?” Qur’an.Surah Ankabut 29:2
Moreover, following quotations from Qur’an and Sunnah prove that the trials and tribulations are not a sign of Allah’s displeasure on someone, rather it is to make apparent who are truly Believers.
“And those who believe and do good – We do not impose upon any of them a burden beyond his capacity. “Qur’an.Surah A’raf 7:42
“On no soul doth Allah place a burden greater than it can bear. “Qur’an.Surah Baqarah 2:286
Narrated Anas ibn Malik®: Allah's Messenger (May Allah honour Him and Grant Him peace) said, The magnitude of the reward goes along with the magnitude of the affliction. When Allah who is Great and Glorious loves people He afflicts them, and those who accept it gladly receive Allah's good pleasure, but those who are displeased receive Allah's displeasure, Tirmidhi 479.