Sayyiduna Ibn Mas'ud (may Allah be pleased with him) said: "When a man mounts a riding animal and does not mention the name of Allah, Satan rides behind him and says to him: Sing. And if he cannot sing, he says to him: Indulge in wishful longings."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8749