﴿ يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ هَلْ أَدُلُّكُمْ عَلَىٰ تِجَٰرَةٍۢ تُنجِيكُم مِّنْ عَذَابٍ أَلِيمٍۢ ﴾

“O YOU who have attained to faith! Shall I point out to you a bargain that will save you from grievous suffering [in this world and in the life to come]?”

In trade, a man first invests and then receives a return on his investment. In the struggle for Faith also one has to invest his strength and his possessions. From this view point, this is also a sort of trade. But, one receives the profit from worldly trade in this world, while in the religion-oriented trade, one receives the profit with further additions only in the Hereafter.