'Steadfast' in the Bible

“They refused to listen and obey,And did not remember Your wondrous acts which You had performed among them;So they stiffened their necks and [in their rebellion] appointed a leader in order to return them to slavery in Egypt.But You are a God of forgiveness,Gracious and merciful and compassionate,Slow to anger and abounding in lovingkindness;And You did not abandon them.