[aruanan]

Nor can I find scripture to support that the Sabbath was changed to Sunday (Venerable Day of the Sun).

I don't think that anyone's maintaining that the Sabbath was changed to Sunday. It's just that Sunday is the Lord's day, being the day he rose from the grave.

[SisterK]

Sunday is the Lord's day, being the day he rose from the grave

This is what is taught. However, the day that Jesus rose from the grave is different than the day set aside in the Ten Commandments, the day set aside to celebrate, to honor and to observe that the Lord created this place in six days and rested on the seventh. Two totally different concepts. The Catholic Church changed the Sabbath from Saturday to Sunday around 300 AD or so because they wanted more pagans to be included in their church. The pagans observed Sunday as sacred - The Venerable Day of the Sun.

[Uri’el-2012]

I don't think that anyone's maintaining that the Sabbath was changed to Sunday. It's just that Sunday is the Lord's day, being the day he rose from the grave.

That is one way of looking at it.

Another way is that Yah'shua rose on the day
following the Shabbat following Pesach
which is the YHvH commanded Feast of First Fruits.

It begins just after sundown after Shabbat(Saturday evening).

The YHvH commanded Feast runs for seven weeks plus one day,
and it ends on the other YHvH commanded Feast of Shavuot ( Pentecost)

See Leviticus 23 for details.

shalom b'SHEM Yah'shua HaMashiach