The song was released as the eleventh track of the collaborative album, Old Church Basement on April 30, 2021.
"Mercy" is a piano-driven song,[6] composed in the key of A with a tempo of 62 beats per minute, and a musical time signature of 44.
[7] The lyrics of the song are testimonial,[8] as the singer affirms "that Jesus is alive in us and that He has rescued us from the grave.
"[6] Joshua Andre, reviewing for 365 Days of Inspiring Media, gave a favorable opinion of the song, describing the song as potential radio single and future Sunday morning staple, further saying, "we are met with a testimony type track that is sure to win over listeners and critics alike.
[12] On May 6, 2021, Elevation Worship released the official music video of "Mercy" on their YouTube channel.