Circumcision of Jesus Day - formerly the justification for the church to celebrate January 1st.
"Almighty God, whose blessed Son was circumcised and for man's sake became obedient to the Law: purify our hearts and all our members, so that we may die to all sinful desires and in all things obey your holy will; through Jesus Christ our Lord. Amen."
- Collect from the BCP.
"When the time had fully come, God sent forth his Son, born of a woman, born under the Law, to redeem those who were under the law." Galatians 4.4-5a.
10 points for naming where the picture is from.