Sunan Abi Dawud Book 5, Hadith 19
'Abd Rabbihi and Yahya b. Sa'id also narrated this tradition from the Prophet (ﷺ) omitting the name of the Companion (mursal). Their grandfather Zaid prayed along with the Prophet (ﷺ).
The Messenger of Allah (ﷺ) saw a person praying after the congregational prayer at dawn was over. The Messenger of Allah (ﷺ) said: There are two rak'ahs of the dawn prayer (i.e. the prescribed rak'ahs). The man replied: I did not pray the two rak'ahs before the dawn prayer. Hence I offered them now. The Messenger of Allah (ﷺ) kept silent.
The Prophet (ﷺ) said: If anyone keeps on praying regularly four rak'ahs before and four after the noon prayer, he will not enter the Hell-fire.
Abu Dawud said: Al-'Ala' bin Al-Harith and Sulaiman bin Musa reported it from Makhul with his chain, similarly.