"While Paul was careful to set before his converts the plain teaching of Scripture regarding the proper support of the work of God, and while he claimed for himself as a minister of the gospel the “power to forbear working” ( 1 Corinthians 9:6 ) at secular employment as a means of self-support, yet at various times during his ministry in the great centers of civilization he wrought at a handicraft for his own maintenance. AA 346.1"
"Or I only and Barnabas, have not we power to forbear working?"
EGW directly quotes 1 Corinthians 9:6 to support her point about Paul's right to be supported.
"And because he was of the same craft, he abode with them, and wrought: for by their occupation they were tentmakers."
While not a direct quote, EGW references Paul's working as a tentmaker, which is described in Acts 18:3. The connection is thematic, focusing on Paul's trade.