Hadith Qudsi 55

55) Narrated Abu Sa'id Al-Khudri : I heard Prophet Muhammad  saying: The devil said to his Lord: By Your Glory and Majesty! As long as the progeny of Adam exists on earth, I shall continuouslymisguide them. At this Allah remarked: By My Glory and Majesty! As long as they seek My forgiveness, I will go on to pardon them.

(This Hadfth is sound and reported by Ahmad in his Musnad).

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To fight the Satan we should always perform the obligatory worshipping deeds timely e.g. Prayers, Zakat, Fasting etc.Besides, remembrance of Allah  is thebestwayoutfromtheSatantraps.