Qur'an 101:8 "He whose balance is light will abide in a bottomless Pit. And what will make you know what it is? It is a fire blazing fiercely!"
Some thinking person must have challenged Muhammad's sanity, so by way of explanation, this spilled from the lips of the most dimwitted prophet of all time: Bukhari:V4B52N112 "Allah's Apostle said, 'Horses are kept for one of three purposes. For some people they are a source of reward, for some they are a means of shelter, and for some they are a source of sins. The one for whom they are a source of reward is he who keeps a horse for Jihad in Allah's Cause. He ties it with a long tether in a meadow or in a garden with the result that whatever it eats from the area of the meadow or garden will be counted as good deeds for his benefit, and if it should break its rope and jump over one or two hillocks then all its dung and its foot marks will be written as good deeds for him. And if it passes by a river and drinks water from it even though he had no intention of watering it, he will get the reward for its drinking. As for the man for whom horses are a source of sins, he is the one who keeps a horse for the sake of pretense, showing enmity for Muslims.' When Allah's Apostle was asked about donkeys, he replied, 'Nothing has been revealed to me about them except this unique, comprehensive Verse: "Then anyone who does a small ant's weight of good shall see it; And anyone who does a small ant's weight of evil, shall see it."' "
In the passage, Muhammad defined "Allah's Cause" as "Jihad." Previously he defined Jihad as fighting or holy war. And while I recognize that many of history's pagans worshiped "war gods," no one takes them seriously today. Islam is the only surviving religotic in which the central purpose is to fight. It's so bad, a man who doesn't turn a productive asset (a beast of burden) into a destructive one (a cavalry mount) is called a sinner. Further, by establishing this Hadith, Muhammad brought Allah down to his level. He said that this inane answer was divinely inspired, something that would be lethal to Islam if Muslims were only given the opportunity to think.