Hopefully you will understand......
Jesus, being a Jew under the Law, observed the Sabbath as God’s Word (not the Pharisees) directed. He knew it was lawful to do fine things on the Sabbath. (Mt 12:12) However, the inspired Christian writings state that “Christ is the end of the Law” (Ro 10:4), which results in Christians’ being “discharged from the Law.” (Ro 7:6) Neither Jesus nor his disciples made any distinction between so-called moral and ceremonial laws. They quoted from the other parts of the Law as well as from the Ten Commandments and considered all of it equally binding on those under the Law. (Mt 5:21-48; 22:37-40; Ro 13:8-10; Jas 2:10, 11) The Scriptures plainly state that Christ’s sacrifice “abolished . . . the Law of commandments consisting in decrees” and that God “blotted out the handwritten document against us, which consisted of decrees . . . and He has taken it out of the way by nailing it to the torture stake.” It was the complete Mosaic Law that was “abolished,” “blotted out,” taken “out of the way.” (Eph 2:13-15; Col 2:13, 14) Consequently, the whole system of Sabbaths, be they days or years, was brought to its end with the rest of the Law by the sacrifice of Christ Jesus. This explains why Christians can esteem “one day as all others,” whether it be a sabbath or any other day, with no fear of judgment by another. (Ro 14:4-6; Col 2:16) Paul made the following expression concerning those scrupulously observing “days and months and seasons and years”: “I fear for you, that somehow I have toiled to no purpose respecting you.”—Ga 4:10, 11.
After Jesus’ death, his apostles at no time commanded Sabbath observance. The Sabbath was not included as a Christian requirement at Acts 15:28, 29, or later. Nor did they institute a new sabbath, a “day of the Lord.” Even though Jesus was resurrected on the day now called Sunday, nowhere does the Bible indicate that this day of his resurrection should be commemorated as a “new” sabbath or in any other way. First Corinthians 16:2 and Acts 20:7 have been appealed to by some as a basis for observing Sunday as a sabbath. However, the former text merely indicates that Paul instructed Christians to lay aside in their homes for their needy brothers at Jerusalem a certain amount each first day of the week. The money was not to be turned in at their place of meeting but was to be retained until Paul’s arrival. As for the latter text, it was only logical that Paul would meet with the brothers in Troas on the first day of the week, since he was leaving the very next day.