It is narrated from Sayyidah Umm Habibah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever keeps regularly to four rak'ahs before the Zuhr prayer and four after it will be made forbidden to Hell."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19747