We Love God!

God: "I looked for someone to take a stand for me, and stand in the gap" (Ezekiel 22:30)

Oath-taking is permitted, but it is not encouraged. In civil life, as in a courtroom, oath-taking is permitted. And when one is put under oath, he or she is not sinning against Christ’s teaching. Also, on rare occasions such a practice may be necessary, as it was for Paul. This said, oaths are not to be a part of everyday conversation. Christians should not need such devices. They should be known to be people of truth.
Kent Hughes