Read Acts 4 today.

Acts 4:32-37 NLT[32] All the believers were united in heart and mind. And they felt that what they owned was not their own, so they shared everything they had. [33] The apostles testified powerfully to the resurrection of the Lord Jesus, and God’s great blessing was upon them all. [34] There were no needy people among them, because those who owned land or houses would sell them [35] and bring the money to the apostles to give to those in need.
[36] For instance, there was Joseph, the one the apostles nicknamed Barnabas (which means “Son of Encouragement”). He was from the tribe of Levi and came from the island of Cyprus. [37] He sold a field he owned and brought the money to the apostles.
The word that comes to my mind as I read this is commitment. The apostles, Barnabas, and the people of the early church in Jerusalem were committed to testifying to the resurrection of Jesus. Their testimony could have been limited to mere words, but it was not. They testified with their words and their actions, even when their actions were sacrificial.
It makes me wonder if our testimony has a sacrificial aspect to it. What does our testimony actually cost us? When Jesus called His disciples, He did not call them to take a step closer to Him. He called them to follow Him. This meant leaving something behind. There was a cost associated with answering that call. What do you have to leave behind in your commitment to testify to the resurrection of Jesus Christ?