´It was narrated from Abu Hurairah that the Prophet (ﷺ) said:` "Whoever catches up with a prostration of Subh before the sun rises, then he has caught up with it; and whoever catches up with a prostration of 'Asr before the sun sets, then he has caught up with it."
´It was narrated from 'Aishah that the Prophet (ﷺ) said:` "Whoever catches up with a Rak'ah of Fajr before the sun rises, then he has caught up with it; and whoever catches up with a Rak'ah of 'Asr before the sun sets, then he has caught up with it."
Hadith Referenceسنن نسائي / كتاب المواقيت / 552
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم
Hadith Takhrij«صحیح مسلم/المساجد 30 (609)، سنن ابن ماجہ/الصلاة 11 (700)، (تحفة الأشراف: 16705)، مسند احمد 6/78 (صحیح)»