Riyad as-Salihin, Book 9, Hadith 1073 (In-Book) ⓘ
Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah said, "No Salat is more burdensome to the hypocrites than the Fajr (dawn) prayer and the 'Isha' (night) prayer; and if they knew their merits, they would come to them even if they had to crawl to do so."[Al-Bukhari and Muslim].
وعنه قال: قال رسول الله صلى الله عليه وسلم : "ليس صلاة أثقل على المنافقين من صلاة الفجر والعشاء ولو يعلمون ما فيهما لأتوهما ولو حبوًا" ((متفق عليه)).