"The example of those who spend their money in the cause of God is that of a grain
that produces seven spikes, with a hundred grains in each spike. God multiplies
this manifold for whomever He wills. God is Bounteous, All Knowing."
The act of dedicating one's self and one's resources to the cause of God is undoubtedly the highest form of devotion to God. Those who do so are promised the highest rewards.
The words in 2:261 reveal the infinite generosity endowed by God on such loyal servants. We are also told about this reward in the following words:
"Those who believe and emigrate and strive in the cause of God with their money and their lives are in the highest rank in the sight of God. These are the winners." 9:20
No talk is better than that which preaches the way to God:
"Who can utter better words than one who preaches the way to God, works righteousness and says, ‘I am among the submitters’? " 41:33
The command to devote and dedicate ourselves and our money to the cause of God is also found in (Sura 22, verse 67) and (Sura 28, verse 87).
The Quran also provides the optimum method of preaching and inviting to God:
"Invite to the way of your Lord with wisdom and sound advice, and debate with them employing the best possible reasoning." 16:125