It is narrated from Sayyiduna Buraydah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "When I entered Paradise, I heard the sound of footsteps ahead of me, so I asked: Who is this?" They said: Bilal. So he (peace and blessings be upon him) told Bilal (may Allah be pleased with him), and he said: "How did you get ahead of me into Paradise?" Bilal (may Allah be pleased with him) replied: O Messenger of Allah! Whenever I lost my ablution, I did not remain without performing ablution, and whenever I performed ablution, I did not remain without praying two rak'ahs after it.
Hadith Referenceالمعجم الكبير للطبراني / باب الباء / 1008