It was narrated from Ibn 'Umar that the Messenger of Allah (ﷺ) said:
"No one of you should deliberately try to pray when the sun is rising, or when it is setting." (RU)
English reference (RU): Vol. 1, Book 6, Hadith 564 (RU)
Arabic reference (RU): Book 6, Hadith 568 (RU)