Evening and morning and at noon I utter my complaint and moan, and He hears my voice. - Psalm 55:17
The Ma'ariv Aravim is a blessing often recited before the declaration of the Shema duing the evening (ma'ariv) service (this blessing corresponds to the Yotzer ha-Me'orot blessing recited before the Shacharit Shema declaration). An abbreviated version of the blessing is provided here:
Blessed art Thou, LORD our God, Master of the universe, whose Word brings on the evening. May the living and eternal God rule over us always and forever. Blessed art Thou, LORD, who brings on the evening.