Deuteronomy 3:6

and we devote them, as we have done to Sihon king of Heshbon, devoting every city, men, the women, and the infants;

Deuteronomy 2:34

and we capture all his cities at that time, and devote the whole city, men, and the women, and the infants -- we have not left a remnant;

Deuteronomy 2:24

Rise ye, journey and pass over the brook Arnon; see, I have given into thy hand Sihon king of Heshbon, the Amorite, and his land; begin to possess, and stir up thyself against him in battle.

Psalm 135:10-12

Who smote many nations, and slew strong kings,

Leviticus 27:28-29

'Only, no devoted thing which a man devoteth to Jehovah, of all that he hath, of man, and beast, and of the field of his possession, is sold or redeemed; every devoted thing is most holy to Jehovah.

Numbers 21:2

And Israel voweth a vow to Jehovah, and saith, 'If Thou dost certainly give this people into my hand, then I have devoted their cities;'

Deuteronomy 3:2

'And Jehovah saith unto me, Fear him not, for into thy hand I have given him, and all his people, and his land, and thou hast done to him as thou hast done to Sihon king of the Amorite who is dwelling in Heshbon.

Deuteronomy 20:16-18

Only, of the cities of these peoples which Jehovah thy God is giving to thee for an inheritance, thou dost not keep alive any breathing;

Joshua 11:14

and all the spoil of these cities, and the cattle, have the sons of Israel spoiled for themselves; only, every human being they have smitten by the mouth of the sword, till their destroying them; they have not left any one breathing.

Psalm 136:19-21

Even Sihon king of the Amorite, For to the age is His kindness.

Treasury of Scripture Knowledge

Summary

And we utterly destroyed them, as we did unto Sihon king of Heshbon, utterly destroying the men, women, and children, of every city.

Bible References

We utterly

Deuteronomy 2:34
and we capture all his cities at that time, and devote the whole city, men, and the women, and the infants -- we have not left a remnant;
Deuteronomy 20:16
Only, of the cities of these peoples which Jehovah thy God is giving to thee for an inheritance, thou dost not keep alive any breathing;
Leviticus 27:28
'Only, no devoted thing which a man devoteth to Jehovah, of all that he hath, of man, and beast, and of the field of his possession, is sold or redeemed; every devoted thing is most holy to Jehovah.
Numbers 21:2
And Israel voweth a vow to Jehovah, and saith, 'If Thou dost certainly give this people into my hand, then I have devoted their cities;'
Joshua 11:14
and all the spoil of these cities, and the cattle, have the sons of Israel spoiled for themselves; only, every human being they have smitten by the mouth of the sword, till their destroying them; they have not left any one breathing.

As we did

Deuteronomy 3:2
'And Jehovah saith unto me, Fear him not, for into thy hand I have given him, and all his people, and his land, and thou hast done to him as thou hast done to Sihon king of the Amorite who is dwelling in Heshbon.
Deuteronomy 2:24
Rise ye, journey and pass over the brook Arnon; see, I have given into thy hand Sihon king of Heshbon, the Amorite, and his land; begin to possess, and stir up thyself against him in battle.
Psalm 135:10
Who smote many nations, and slew strong kings,
Psalm 136:19
Even Sihon king of the Amorite, For to the age is His kindness.