Loved this post from Dane Ortlund wherein he collects the references for the single most repeated command in Deuteronomy.
You probable wouldn’t guess it was this one…
…and you shall rejoice, you and your households, in all that you undertake. (Deut 12:7)
And you shall rejoice before the LORD your God, you and your sons and your daughters, your male servants and your female servants… (12:12)
And you shall rejoice before the LORD your God in all that you undertake. (12:18)
And you shall eat there before the LORD your God and rejoice, you and your household. (14:26)
And you shall rejoice before the LORD your God… (16:11)
You shall rejoice in your feast, you and your son and your daughter… (16:14)
…because the LORD your God will bless you in all your produce and in all the work of your hands, so that you will be altogether joyful. (16:15)
And you shall rejoice in all the good that the LORD your God has given to you and to your house… (26:11)
…and you shall sacrifice peace offerings and shall eat there, and you shall rejoice before the LORD your God. (27:7)
Because you did not serve the LORD your God with joyfulness and gladness of heart… (28:47)
‘Rejoice with him, O heavens…’ (32:43)
‘Rejoice, Zebulun, in your going out, and Issachar, in your tents.’ (33:18)