Sabr is an Arabic word that means "endurance," "bearing," "resisting pain, suffering, and difficulty," and "dealing calmly with problems". In Islam, it is one of the two parts of faith, the other being shukr (gratitude) . Sabr teaches Muslims to remain spiritually steadfast and to keep doing good actions in the personal and collective domain, specifically when facing opposition or encountering problems, setbacks, or unexpected situations.

The concept of Sabr is associated with many different meanings and degrees. According to the famous scholar Nasir al‑Din al‑Tusi, Sabr means restraining oneself from agitation when confronted with undesirables. The great gnostic Khwajah `Abd Allah al‑Ansari said that Sabr means restraining oneself from complaint about hidden anguish. There are various degrees and levels of Sabr, and the reward and merit vary in accordance with degree and level.

Sabr produces many good results that include the training and discipline of the soul. If a person bears patiently with misfortunes and calamities for some time and seriously endures the hardships entailed during worship, rites, and the bitterness arising from the renunciation of forbidden pleasures, it gradually becomes easy for them to bear with the hardships and difficulties. Sabr is also the ability to accept any life reality as fated by the will of Allah, and it protects an individual from grumbling, weeping over what had happened, damaging objects, harming others, and doing any counterproductive behaviors.

In Islam, Sabr is regarded as half of ones religious life, and it is a virtue that enables Muslims to proceed towards worthy goals and remain unaffected by difficult situations. It is a form of worship that commits Muslims to the Will of Allah while truly accepting whatever He has written for them. Sabr is also the biggest Blessing and Mercy of Allah that He has bestowed upon Muslims.