Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates: I heard the Prophet (peace and blessings be upon him) encouraging the night prayer in Ramadan; however, the Prophet (peace and blessings be upon him) did not gather (the people) for the night prayer in Ramadan. (Allamah al-Haythami says:) I say: This part of it is narrated in the Sahih: "The Prophet (peace and blessings be upon him) used to encourage the night prayer in Ramadan."
Ahmad recorded it, and its chain is hasan (good).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصيام / 5016
Hadith Gradingمحدثین:إسنادہ حسن۔
Hadith Takhrij«أخرجه مسند أحمد برقم: 7821، وأخرجه سنن الدارمي برقم: 1776، وأخرجه فتح الباري برقم: 35، وأخرجه صحيح ابن خزيمة برقم: 2202»