Prayer is an act of worship commanded by Allah SWT to all Muslims as proof of servitude and obedience to Allah SWT. Prayer according to language is prayer.
While prayer according to the syarak perspective is a specific reading and act that starts with saying takbeer and ends with salam. There are so many verses of the Quran and also hadiths of the Prophet SAW about the prescription of prayer. Among the arguments for the obligatory prayer based on the Qur'an is the saying of Allah SWT in Surah Al-Baqarah verse 43:
And perform prayer, and pay zakat, and kneel with those who kneel.
It means: And stand up for prayer and give zakat and bow down together with those who bow down.
Similarly, the words of Allah SWT in surah al-Hajj verse 78:
So perform prayer and pay zakat
Meaning: Therefore, establish prayer and give zakat
While the hadiths that explain the prescription of prayer are like the hadith from Abdullah bin Umar RA, that the Prophet SAW said:
Islam is built on five things: bearing witness that there is no god but God and that Muhammad is the Messenger of God, establishing prayer, paying zakat, performing the Hajj to the House, and fasting during Ramadan.
Meaning: Islam has been built on five things, testifying that there is no god but Allah and Prophet Muhammad is the messenger of Allah, establishing prayer, paying zakat, performing Hajj to the house and fasting in the month of Ramadan.
[HR : Bukhari & Muslim]
This hadith clearly states that Islam consists of five things. The five things mentioned in this hadith are the five pillars of Islam that we must obey. Imam al-Nawawi in Sharah Sahih Muslim said that "this hadith is a very great basis for knowing religion and belief in these five things and these five things are gathered together as the pillars of Islam". The five pillars of Islam stated in the hadith are like a pillar of Islam itself.
According to Ibnu Rajab al-Hanbali in Jami' al-Ulum Wa al-Hikam , Islam is built on these five things which are likened to the pillars and pillars of the construction of Islam itself. So it is clear to us that Muslims must adhere to and believe in these five pillars of Islam. In addition, one of the pillars is prayer.
Pillar of Religion