As Allah describes the sheer bliss in the Heavens which He has prepared for the believers in the Hereafter, He pays the attention the fact that Paradise is the best reward that a person may win. Almighty God says,
Indeed, the righteous will be in pleasure. * On adorned couches, observing. * They will be given to drink [pure] wine [which was] sealed. * The last of it is musk. So for this let the competitors compete. (Al-Mutaffifin 83:22-26)
The biggest prize is Paradise indeed, not anything else. So, the believers should compete to win it through observing everything that keeps one close to God and making use of the blessed times when the rewards are doubled by offering acts of worship as much as possible during them.
Among the great opportunities and the blessed times for the competitors of Paradise is the first 10 days of Dhul-Hijjah. The excellence of these days has been expressed in numerous hadiths of the Prophet (peace be upon him). He (peace be upon him) said: “There are no deeds as excellent as those done in these ten days.” They (the companions) said, “Not even Jihad?” He (peace be upon him) said, “No, not even Jihad except a man who goes forth endangering his life and wealth and does not return with anything.” (Al-Bukhari)