Silsilah as-Sahihah 644 — When to make up missed Sunnah before Fajr

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 was unable to perform the two Sunnah (rak‘ahs) of Fajr, let him offer them after sunrise."