Sin means “to miss the mark” (betraying God). Sin is falling short of God's glory (Romans 3:23).
Trespassing, on the other hand, is crossing a line or climbing a fence you shouldn't. Trespass is falling away from God in rebellion after you were walking close to God.
Sins and transgressions can happen WITHOUT PREMEDITATION. These sins don't necessarily have to be iniquities.
However, iniquity is continuous PREMEDITATED sinning (crookedness and perverseness) without repentance. These people purposely sin, refuse to repent, and thus end up with a reprobated mind (Romans 1).
“Woe to them that devise iniquity and work evil upon their beds! When the morning is light, they practice it, because it is in the power of their hand. And they covet fields, and take them by violence; and houses, and take them away: so they oppress a man and his house, even a man and his heritage" (Micah 2:1-2).
“For I do confess my guilt and iniquity; I am filled with anxiety because of my sin” (Psalm 38:18, AMP).
"Wash me thoroughly from my iniquity,
and cleanse me from my sin" (Psalm 51:2)!
"but if you do not forgive others their trespasses, neither will your Father forgive your trespasses" (Matthew 6:15).
"Blessed is the one whose transgression is forgiven, whose sin is covered" (Psalm 32:1).
"Therefore, just as sin came into the world through one man, and death through sin, and so death spread to all men because all sinned" (Romans 5:12).
"For I know that nothing good dwells in me, that is, in my flesh. For I have the desire to do what is right, but not the ability to carry it out" (Romans 7:18).
"For this reason Christ is the mediator of a new covenant, that those who are called may receive the promised eternal inheritance—now that he has died as a ransom to set them free from the sins committed under the first covenant" (Hebrews 9:15).
"If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness" (1 John 1:9).
For the director of music. A psalm of David. When the prophet Nathan came to him after David had committed adultery with Bathsheba.
1Have mercy on me, O God,
according to your unfailing love;
according to your great compassion
blot out my transgressions.
2Wash away all my iniquity
and cleanse me from my sin.
3For I know my transgressions,
and my sin is always before me.
4Against you, you only, have I sinned
and done what is evil in your sight;
so you are right in your verdict
and justified when you judge.
5Surely I was sinful at birth,
sinful from the time my mother conceived me.
6Yet you desired faithfulness even in the womb;
you taught me wisdom in that secret place.
7Cleanse me with hyssop, and I will be clean;
wash me, and I will be whiter than snow.
8Let me hear joy and gladness;
let the bones you have crushed rejoice.
9Hide your face from my sins
and blot out all my iniquity.
10Create in me a pure heart, O God,
and renew a steadfast spirit within me.
11Do not cast me from your presence
or take your Holy Spirit from me.
12Restore to me the joy of your salvation
and grant me a willing spirit, to sustain me.
13Then I will teach transgressors your ways,
so that sinners will turn back to you.
14Deliver me from the guilt of bloodshed, O God,
you who are God my Savior,
and my tongue will sing of your righteousness.
15Open my lips, Lord,
and my mouth will declare your praise.
16You do not delight in sacrifice, or I would bring it;
you do not take pleasure in burnt offerings.
17My sacrifice, O God, is b a broken spirit;
a broken and contrite heart
you, God, will not despise.
18May it please you to prosper Zion,
to build up the walls of Jerusalem.
19Then you will delight in the sacrifices of the righteous,
in burnt offerings offered whole;
then bulls will be offered on your altar.
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