بسم الله الرحمن الرحيم
Allah سبحانه و تعالى stated in Surat Yunus, ayat number 58, the meaning of which is, “Say: “In the Bounty of Allah, and in His Mercy (i.e. Islam and the Quran); -therein let them rejoice.” That is better than what (the wealth) they amass.”
Before mentioning the explanation of this ayat, we should mention that Allah سبحانه و تعالى has mentioned in the previous ayat that indeed an admonishen and good advice has come to the people from Allah, warning the people from the actions that cause the displeasure of Allah and bring about the punishment, then similarly it was mentioned that the Qur’an is a healer for that which is found in the breasts of mankind; be it from desires of various sorts, or doubts from the whisperings of the Shaytaan cast upon them, causing what was once certainty in their belief to become uncertain. Then it was mentioned that it is a guidance and mercy for the believers in directing them to the pleasure of Allah and the righteous actions.
Then Allah stated that they should rejoice in the Bounty and Mercy of Allah; many of the scholars state that the Bounty of Allah is the Qur’an itself, such as Shaikh ‘AbdurRahman as-Sa’di, and that the Qur’an is the greatest blessing bestowed upon the creation, a virtue from Allah upon us. Since the Quran no doubt guides and removes the people from darkness into light, from ignorance into knowledge, from shirk into tawhid.
As for the Mercy, then it is stated that it is the religion of Islam, and eemaan in the hearts of the believers, and the love the servant of Allah finds in his heart for his Creator and the knowledge of who the Creator is.
These are the two affairs Allah states the believers should rejoice upon, for indeed they are connected to the happiness of this World and the Hereafter, and there is no comparison between those two affairs and anything else in the World a person may have, since everything a person may achieve and rejoice with from the worldly affairs will all come to an end and perish at some point, whereas guidance and worship will save him after death in the Herafter. So Allah ordered that we are pleased with those affairs of the Qur’an and the guidance to the religon and eemaan, since that will cause peace and serenity within our hearts to further our worship of Allah. Similarly, upon recognising the greatness of those affairs causes a person to wish to thank his Lord, and so he increases in his worship.
Therefore this type of rejoicing is praiseworthy, rejoicing over the greatest blessings Allah has bestowed upon us in guiding us and revealing the Qur’an and Sunnah and therefore acting and implementing them, rejoicing does not mean innovating new celebrations or gatherings as some of the sufi sects may do, and consequently always asking Allah to keep us firm upon the correct path and increase us in knowledge.
[Based on Shaikh ‘AbdurRahman as-Sa’di’s explanation of the ayat]