Yeap its the usual argument of should we follow the law or not (basically, do whatever you want with no consequences)
Jesus never stated the old law is no longer required, far from it - Matt 5:17 - Do not think that I have come to abolish the law .........
1) Do you accept that Revelations clearly states that some of the law is still valid as this is the last book after Paul and others?
2) Matthew 23:23 - Woe unto you, scribes and Pharisees, hypocrites! for ye pay tithe of mint and anise and cummin, and have omitted the weightier matters of the law, judgment, mercy, and faith: these ought ye to have done, and not to leave the other undone.
3) coming back to Acts - Acts 21:20-26 The next day Paul took the men and purified himself along with them. Then he went to the temple to give notice of the date when the days of purification would end and the offering would be made for each of them. (clearly following some laws)