The sole obligation of a believer is to serve Allah. The one and only reason for our existence is to be His servants. Life based on any other reasoning than this, means denial of the religion and worshipping idols besides Allah, which will consequently lead to Hell.
In other words, life is only a tool for a believer. He should regard every moment of his life as a means of getting closer to Allah and serving His cause. If this tool ever turns into his aim—which is indeed true of the unbelievers — he will soon find himself in great danger.
Believers live for only one cause; and that is to serve Allah, and for this they have abandoned the world. Allah explains this as:
“Allah has purchased of the believers their persons and their properties; for theirs (in return) is the garden (ofParadise): they fight in His cause, and slay and are slain: a promise binding on Him in truth, through the Torah, the Gospel, and the Qurâ€™an: and who is more faithful to his covenant than Allah? Then rejoice in the bargain which you have concluded: that is the achievement supreme.” (Surat at-Tawba, 9:111)
The believers have sold their lives and goods to Allah and have no further title to them. Their entire lives are conducted in the way that Allah commands. If Allah offers them a blessing, they are grateful to Him, and when He commands them to strive in His cause, they do not feel a momentâ€™s hesitancy, even if they know that they are going to their deaths.
Such believers do not shirk any form of self-sacrifice and nothing on earth can prevent them from struggling for Allahâ€™s cause. They are able to leave behind all the beautiful blessings of Allah and can give up their very lives without any hesitation. On the contrary, the opposite behavior would be the sign that they had not sold their goods and lives to Allah as yet. Such a deficiency in faith will be marked down against them in the life to come.
“Say: If your fathers, your sons, your brothers, your mates, your kindred, the wealth that you have gained, the commerce in which you fear a decline, or the dwellings in which you delight are dearer to you than Allah, or His Messenger, or striving in His cause then wait until Allah brings about His decision. Allah guides not the rebellious." (Surat at-Tawba, 9:24)
This faith was so strong in the companions of the Prophet Mohammed that, not only did they never refuse to fight, but there were some, on the contrary, who even wept when they did not have the opportunity to go into battle along with Mohammed. In the verse below, Allah explains the difference between the sincere and the half-hearted:
“There is no blame
on those who are infirm, or ill or who find no resources to
spend (on the cause), if they are sincere (in duty) to Allah
and His Messenger. No ground of complaint can there be against
the good-doers: Allah is Oft-forgiving, Most Merciful. Nor (is
there blame) on those who came to you to be provided with mounts,
and when you said ‘I can find no mounts for youâ€™,
they turned back, their eyes streaming with tears of grief that
they had no resources to spend (on the cause). The way (to blame)
is only against those who ask permission of you though they
are rich; they prefer to stay with the those who remain behind:
Allah has sealed their hearts; so they know not.” (Surat
BY HARUN YAHYA, GOODWORD PRESS, INDIA, 1999