According to a written commentary in Judaism there is a need for two witnesses to attest to the reality of a completed accomplishment. That’s why Jesus sent the apostles two by two to serve as witness to each others good deeds. But more than that I think the twelve were sent two by two to be of help to each other, to strengthen each other whenever they feel like giving up in making a positive impact in the lives of their fellowmen.
Jesus emphasized to the apostles their complete trust and confidence on Him because He will provide for them. That’s why He said: “Take nothing with you except for your walking stick: “No food, no sack, no money in your belts.”
By our Baptism we also share in the mission of the twelve, we are also being commissioned by Jesus to heal those who are emotionally and spiritually wounded because of poverty largely created by the harsh economic environment that we are in right now.
There’s a lot of them nowadays maybe they’re your poor siblings, parents, neighbor or even a complete stranger just passing by you. Let’s not worry about ourselves Jesus will take care of us in return as what He did with the apostles.