'Serving' in the Bible

But Martha was cumbered about much serving, and came to him, and said, Lord, dost thou not care that my sister hath left me to serve alone? bid her therefore that she help me.

Serving the Lord with all humility of mind, and with many tears, and temptations, which befell me by the lying in wait of the Jews:

Unto which promise our twelve tribes, instantly serving God day and night, hope to come. For which hope's sake, king Agrippa, I am accused of the Jews.

Not slothful in business; fervent in spirit; serving the Lord;

For we ourselves also were sometimes foolish, disobedient, deceived, serving divers lusts and pleasures, living in malice and envy, hateful, and hating one another.