Only references to similar verses from various scriptures are provided, so the full scriptures are not available.
Quran 8:15
O you who have believed, when you meet those who disbelieve advancing [for battle], do not turn your backs to them [in flight] *Psalms 78:9* - 10
Quran 8:61
And if they incline to peace, then incline to it [also] *BookOfJasher 40:46* - 47 and trust in God. Indeed, it is He who is the Hearing, the Knowing.
Quran 8:66
Now, God has lightened [the hardship] for you, and He knows that weakness is among you. So if there are one hundred steadfast among you, they will overcome two hundred. And if there are a thousand among you, they will overcome two thousand by permission of God. *Leviticus 26:8*, *Joshua 23:10*, *1Maccabees 3:17 - 18 And God is with the steadfast.