Abu Huraira narrates that once At the time of the Fajr prayer the Prophet (ﷺ) asked Bilal:
Tell me about the most hopeful act (i.e one which you deem the most rewarding with Allah) you have done since your acceptance of Islam because I heard the sound of the steps of your shoes in front of me in paradise.
Bilal replied:
I do not consider any act more hopeful than that whenever I make ablution (wudu) at any time of night or day, I offer salah (prayer) for as long as was destined for me to offer. — Sahih al-Bukhari and Sahih Muslim
After completion of the wudhu of two rakats is full of blessings (sawāb).
It should not be performed during the improper (makruh) times. (When the sun rises, when it is at zenith; 10 minutes before Zuhr time and when it sets.)
Tahiyat Al-Masjid
(“greeting the mosque”) is Sunnah according to most of the scholars; some of the scholars stated that there was consensus on this point.
Abu Qataadah (may Allah be pleased with him) said: The Prophet (blessings and peace of Allah be upon him) said: “When one of you enters the mosque, let him not sit down until he has prayed two rak‘ahs.”
Narrated by al-Bukhaari, 1167; Muslim, 714