ANSWER:
Al-Nasaa’i (1817) and al-Tirmidhi (428) narrated from Umm Habeebah (may Allaah be pleased with her) that the Prophet (peace and blessings of Allaah be upon him) said: “Whoever prays four (rak’ahs) before Zuhr and four after it, the Fire will not touch him.”
The version narrated by al-Tirmidhi says: “Whoever regularly performs four rak’ahs before Zuhr and four after it, Allaah will forbid him to the Fire.”
The hadeeth was classed as saheeh by al-Albaani in Saheeh al-Nasaa’i.