Sunan an-Nasa'i
The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day
كتاب قيام الليل وتطوع النهار
Chapter 67: The differences in the reports from Ismail bin Abi Khalid
الاِخْتِلاَفِ عَلَى إِسْمَاعِيلَ بْنِ أَبِي خَالِدٍ
Translation
It was narrated from Umm Habibah that
The Prophet (ﷺ) said: "Whoever prays four rak'ahs before Zuhr and four after, the Fire will not touch him."