وَالَّذِينَ يُؤْمِنُونَ بِمَآ أُنزِلَ إِلَيْكَ وَمَآ أُنزِلَ مِن قَبْلِكَ وَبِالأْخِرَةِ هُمْ يُوقِنُونَ
“And who have faith in what is revealed to you and in what was revealed before you, and in the Hereafter they are certain.”
The people described here (2:4) are those whom Allah subhanahu wa ta`ala described in the preceding ayah.
وَالَّذِينَ يُؤْمِنُونَ بِمَآ أُنزِلَ إِلَيْكَ
“And who have faith in what is revealed to you (Muhammad).”
It means, the people of emaan believe in what Allah subhanahu wa ta`ala sent them with, and in what the previous Messengers were sent with. They neither distinguish between them, nor do they reject what they were sent with from their Lord.
وَمَآ أُنزِلَ مِن قَبْلِكَ
“And that was revealed before you (Muhammad)”.
What was revealed before you means the past Scriptures: Torah and Bible. We believe in all of them because they all were for hidayah (guidance), given to other prophets to provide Allah’s message so that people can understand true meaning of guidance.
وَبِالأْخِرَةِ هُمْ يُوقِنُونَ
“And in the Hereafter they are certain.”
Believers are those who are certain about the life after death and the Day of Judgment when Allah subhanahu wa ta`ala will ask them about all their good and bad deeds. Hell or heaven will be decided. Emaan was mentioned about a lot of things, but yaqeen (certainty) was mentioned about the afterlife. It is because our actions of emaan are only useful when we have certainty of belief in the Hereafter. The Hereafter is so named because it comes after this earthly life.
أُوْلَٰـئِكَ عَلَى هُدًى مِّن رَّبِّهِمْ وَأُوْلَٰـئِكَ هُمُ الْمُفْلِحُونَ
“Those are upon [right] guidance from their Lord, and it is those who are the successful.”
Allah subhanahu wa ta`ala said those who believe in the Unseen, establish the prayer, spend from what Allah subhanahu wa ta`ala has granted them, believe in what Allah subhanahu wa ta`ala has revealed to the Messenger and the Messengers before him, believe in the Hereafter with certainty, and prepare the necessary requirements for the Hereafter by performing good deeds and avoiding the prohibitions they are:
“…upon [right] guidance”.
Meaning they are on a right course and have insight from Allah subhanahu wa ta`ala. About these people it was further said,
وَأُوْلَـئِكَ هُمُ الْمُفْلِحُونَ
“And it is those who are the successful”.
Muf’lihoon is from falah meaning success. It is not easy to be successful, success always comes after the hard work, effort and as a Muslim we believe we will get falah in the form of Jannah.
In arabic, Flaha/mufleh means farmer. It symbolizes with his hard work, that he ploughs the earth, sows the seed, gives water, looks after his crops and at the end gets fruit. Similarly, if one does great effort in this world to get the love of Allah subhanahu wa ta`ala and does this according to what is described in the Qur’an and proven by Sunnah, he will, in sha Allah, get guidance and Falah on the Day of Judgment.