text: who can tell when the sabbath was changed to sunday by god,(fact)-was not. read 4th commandment then 1john 2:4 can anyone prove it was. the catholics changed it and no they dont have the authority to do so either. which day is the sabbath? is it saturday? on which day should a christian worship? i believe it is sunday. the saturday sabbath was given to israel. ezekiel 20:12,20 states: i gave them [israel] my sabbaths, to be a sign between me and them, that they might know that i am the lord and also hallow my sabbaths; and they shall be a sign between me and you [israel]. this was the first covenant to israel.  christians have a new covenant. jesus made a surety of a better testament (hebrews 7:22). he [christ] is the mediator of a better covenant (hebrews 8:6). he [christ] is the mediator of the new testament [or new agreement] (hebrews 9:15).  because of his death and this new agreement, we are no longer under ceremonial laws involving days. moral laws are in effect in believer's hearts, but not the ceremonial laws. proof? god says in colossians 2:14,16 that christ [blotted] out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross.... let no man therefore judge you in meat, or in drink, or in respect of an holy- day, or of the new moon, or [get it!] of the sabbath days.  we are not under the law, but under grace (romans 6:14). god's moral law is written within and upon the hearts of believers, but ceremonial laws involving days have been nailed to the cross. we honor the saviour of the new covenant on a new day -- the day of his resurrection, which is sunday, the first day of the week. this we do out of love, not servitude, not through law, but through grace.