What is the biblical basis for tithing and NOT keeping the Sabbath at the same time?

Many (most?) churches encourage their members to tithe (let's call these churches A), and many have a biblical basis for it, e.g.: - https://christianity.stackexchange.com/q/62509/50422 - https://christianity.stackexchange.com/q/87050/50422 Similarly, many (most?) churches do NOT keep the sabbath (let's call these churches B), and many of them have a biblical basis for it as well, e.g.: - https://christianity.stackexchange.com/q/82507/50422 - https://christianity.stackexchange.com/q/84626/50422 Now, I'm curious about those churches in the intersection between A and B, namely, those that encourage tithing AND do not keep the Sabbath **at the same time**. I'm struggling to see how this could possibly be a self-consistent position to hold. Both tithing and sabbath keeping were Old Testament laws, so if I were somehow forced to defend tithing as a law still binding on New Testament Christians, I'm unable to think of a single argument that wouldn't also lead to the unescapable conclusion that sabbath keeping is also binding. In my (possibly uninformed) opinion, if we have to tithe, then we have to keep the sabbath too. **Question**: What is the biblical basis for tithing and NOT keeping the Sabbath AT THE SAME TIME?