The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
trespass offering
The trespass-offerings have in view rather the injury which sin does than its guilt - which is the sin-offering aspect. What is due to God's rights in every human being is here meant. (Psa 51:4); is a perfect expression of this.
atonement
(See Scofield) - (Exo 29:33).