It is narrated from Sayyiduna Ka'b bin Ujrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever performs ablution and does it well, then sets out for the Masjid of Quba, intending nothing else, and goes out only to pray in the Masjid of Quba, then prays four rak'ahs in it, reciting Surah al-Fatihah in every rak'ah, will have a reward equal to that of one who performs Umrah to the House of Allah."
Hadith Referenceالمعجم الكبير للطبراني / باب الكاف / 16369