Muwatta Malik 19
Mauquf Sahih Graded by Salim al-Hilali Book of The Times of Prayer · Hadith 19 of 1,858حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَقُولُ دُلُوكُ الشَّمْسِ مَيْلُهَا .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar used to say, "Duluk ash-shams begins from when the sun passes the meridian
References
Muwatta Malik 19
In-book: Book 1, Hadith 19 Source: hadith-api (fawazahmed0)