It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Whoever performs one rak‘ah of the Fajr prayer before sunrise, and then the sun rises, he should complete the second rak‘ah with it.
Hadith Referenceالفتح الربانی / كتاب الصلاة / 1194
Hadith Gradingمحدثین:صحیح
Hadith Takhrij«اسناده صحيح علي شرط مسلم ، (انظر مسند أحمد ترقيم الرسالة: 10339 ترقیم بيت الأفكار الدولية: 10344»