It is narrated from Sayyiduna Ibn Amr (may Allah be pleased with him) that some people who exerted themselves greatly in worship were mentioned before the Noble Prophet (peace and blessings be upon him). The Noble Prophet (peace and blessings be upon him) said: "These are the froth of Islam, and every froth has a burst of speed, and every burst of speed comes to an end. If the end and cessation of that speed is upon moderation and the Sunnah, then the objective is achieved. But if its end is towards disobedience and sins, then that person is destroyed."