They were delighted to hear this and promised to give him money. So he watched for an opportunity to hand him over. (NIV)
And when they heard it, they rejoiced and were delighted, and they promised to give him money. And he [busying himself continually] sought an opportunity to betray Him. (AMP)
And when they heard it, they were glad, and promised to give him money. And he sought how he might conveniently betray him. (KJV)