Isn't it true that Muhammad encouraged his followers to indulge in sexual immorality by offering them Byzantine women as concubines?

The verse in question (S. 9:49) was revealed in a specific context regarding Jadd b. Qays, who was reluctant to join the battle due to his fear of temptation from women. This indicates that the concern was about the integrity of faith rather than a blanket encouragement of sexual immorality. The Prophet's response to Jadd highlights the seriousness of commitment to the cause and the dangers of hypocrisy. The subsequent discussions about Jadd's character further emphasize that the Prophet did not condone his cowardice or miserliness, but rather sought to encourage bravery and faithfulness among his followers. Thus, the narrative serves to illustrate the importance of resisting temptation and remaining steadfast in one's duties rather than promoting lustful indulgence.