Allah's Messenger (S) said: "Whoever prays four before Az-Zuhr and four after, Allah makes him prohibited for the Fire."
Jami` at-Tirmidhi Book 2, Hadith 280
← Previous Hadith "When the Prophet (S) would not perform the four Rak'ah before Az-Zuhr he would pray them after it."

Jami` at-Tirmidhi Book 2, Hadith 279 Next Hadith → She heard Allah's Messenger (S) saying: "Whoever maintains four Rak'ah before Az-Zuhr and four after it, Allah makes him prohibited for the Fire."

Jami` at-Tirmidhi Book 2, Hadith 281