The Catechism in Questions & Answers

676. When are ordinations, appointments, reinstatements, and retirements performed in the divine service?

Ordinations—in which a spiritual ministry is imparted—as well as appointments of congregational rectors or district rectors, reinstatements of ministers to a ministry, and retirements of ministers take place after the sacraments have been dispensed. They thus take place after the celebration of Holy Communion.

Ordination: see Questions 462. et seq.