Deuteronomy 6:5
4 Hear, O Israel: The Lord is our God, the Lord is one! 5 You must love the Lord your God with your whole mind, your whole being, and all your strength. 6 These words I am commanding you today must be kept in mind, 7 and you must teach them to your children and speak of them as you sit in your house, as you walk along the road, as you lie down, and as you get up.
Tobit 13:6
5 He will afflict you for your iniquities, but he will again show mercy on all of you. He will gather you from all the nations among whom you have been scattered. 6 If you turn to him with all your heart and with all your soul, to do what is true before him, then he will turn to you and will no longer hide his face from you. So now see what he has done for you; acknowledge him at the top of your voice. Bless the Lord of righteousness, and exalt the King of the ages. In the land of my exile I acknowledge him, and show his power and majesty to a nation of sinners: "Turn back, you sinners, and do what is right before him; perhaps he may look with favor upon you and show you mercy.'
Notes and References
"... Toward the end of the book, after Tobit’s blindness is healed, he recites a hymn of praise to God, directing his fellow Israelites: “[T]urn to him [God] with all your heart and with all your soul, to do what is true before him, then he will turn to you and will no longer hide his face from you” (Tobit 13:6; emphasis added). Here, Tobit’s use of the Shema reflects the author’s belief that the traumatic circumstances of the Exile were a direct result of failure to honor the covenant on a national level. Repentance, a renewed pledge of allegiance to the divine king, and obedience to his commands, will usher in a new age of divine favor and restore the nation to the Land ..."
Baron, Lori Ann Robinson The Shema in John’s Gospel Against its Backgrounds in Second Temple Judaism (p. 94) Duke University, 2015