Tobit 4:6

6 For if thou deal truly, thy doings shall prosperously succeed to thee, and to all them that live justly.

Tobit 4:6 In-Context

4 Remember, my son, that she saw many dangers for thee, when thou wast in her womb: and when she is dead, bury her by me in one grave.
5 My son, be mindful of the Lord our God all thy days, and let not thy will be set to sin, or to transgress his commandments: do uprightly all thy life long, and follow not the ways of unrighteousness.
6 For if thou deal truly, thy doings shall prosperously succeed to thee, and to all them that live justly.
7 Give alms of thy substance; and when thou givest alms, let not thine eye be envious, neither turn thy face from any poor, and the face of God shall not be turned away from thee.
8 If thou hast abundance give alms accordingly: if thou have but a little, be not afraid to give according to that little:

The Brenton translation of the Septuagint is in the public domain.