Contradiction with Numbers 23:19
God is not a man, that he should lie; neither the son of man, that he should repent. In contrast, Jeremiah 4:2 implies that swearing truthfully by God's name needs to align with righteousness, which suggests a human element of accountability.
Numbers 23:19: God [is] not a man, that he should lie; neither the son of man, that he should repent: hath he said, and shall he not do [it]? or hath he spoken, and shall he not make it good?
Contradiction with Hebrews 6:18
It is impossible for God to lie, which asserts God's infallible truthfulness. Jeremiah 4:2 suggests a context dependent on humans swearing truthfully, which could imply room for dishonesty if not heeded.
Hebrews 6:18: That by two immutable things, in which [it was] impossible for God to lie, we might have a strong consolation, who have fled for refuge to lay hold upon the hope set before us:
Contradiction with Romans 3:4
Let God be true, but every man a liar, highlights the idea that God's truth stands independent of human actions. Jeremiah 4:2 focuses on the human responsibility to swear truthfully by Him, implying a reliance on human fidelity.
Romans 3:4: God forbid: yea, let God be true, but every man a liar; as it is written, That thou mightest be justified in thy sayings, and mightest overcome when thou art judged.
Contradiction with James 5:12
But above all things, my brethren, swear not, suggests avoiding oaths altogether, while Jeremiah 4:2 discusses the condition of swearing truthfully if one is to swear by God.
James 5:12: But above all things, my brethren, swear not, neither by heaven, neither by the earth, neither by any other oath: but let your yea be yea; and [your] nay, nay; lest ye fall into condemnation.
Paradox #1
The possible contradiction in Jeremiah 4:2 could be that it emphasizes truthfulness and righteousness as virtues, but throughout the Bible, there are instances where actions like deception or violence are depicted in other contexts or by other characters. This could be seen as inconsistent if compared with other verses where different moral actions are taken.