Musnad Ahmad 30:1367

Yunus and Hajjaj narrated to us, they said: Layth narrated to us, Sa'id ibn Abi Sa'id narrated to me, from Abu 'Ubaydah, from Sa'id ibn Yasar, that he heard Abu Hurayrah saying: The Messenger of Allah (peace and blessings of Allah be upon him) said: "None of you performs ablution and perfects his ablution and completes it, then comes to the mosque desiring nothing but prayer therein, except that Allah rejoices at him, just as the family of one who is absent rejoices at his arrival."