Sayyiduna Abdullah bin Amr (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) said . . . . . . and he narrated a hadith in which it was also mentioned: "Indeed, for every doer there is enthusiasm (in action), and for every enthusiasm there is a period of slackness."
Hadith Referenceمسند الشهاب / 1026
Hadith Gradingمحدثین:إسناده حسن
Hadith Takhrij«إسناده حسن ، وأخرجه أحمد : 2/158 ، شرح مشكل الآثار : 1236 ، التمهيد لابن عبد البر : 1/ 196»