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»
Sayyiduna Ibn Abbas (may Allah be pleased with him) reports that the Prophet (peace and blessings be upon him) had some freed slaves who used to fast continuously and stand in prayer at night. It was mentioned to the Prophet (peace and blessings be upon him), so he said: "Indeed, for every doer of deeds there is enthusiasm, then for that enthusiasm there is a period of slackening."
Hadith Referenceمسند الشهاب / 1027
Hadith Gradingمحدثین:إسناده ضعيف جدا
Hadith Takhrij«إسناده ضعيف جدا ، وأخرجه بزار : 4940 ، شرح مشكل الآثار : 1241» مسلم سخت معیف ہے ۔