´Abdullah bin As-Sa'ib narrated:` "Allah's Messenger would pray four (Rak'ah) after the Zawal of the sun before Az-Zuhr. He said: 'It is an hour in which the gates of the heavens are opened, and I love that a righteous deed should be raised up for me in it.'"
Explanation & Benefits
Shaykh Dr. Abdur Rahman Freywai
1:
It is possible that these four rak‘ahs of Sunnah before Zuhr are the same emphasized Sunnah (sunnah mu’akkadah). No one has clarified whether these are two separate prayers or both are the same.
2:
This hadith has been narrated by Abu Dawud and Ibn Majah, and the portion “he would say the salam at the end” is weak (see Sahih Abu Dawud 1153).
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 478