'Needful' in the Bible

but to be merry, and to be glad, it was needful, because this thy brother was dead, and did live again, he was lost, and was found.'

Let no corrupt word out of your mouth go forth, but what is good unto the needful building up, that it may give grace to the hearers;

and any one of you may say to them, 'Depart ye in peace, be warmed, and be filled,' and may not give to them the things needful for the body, what is the profit?