What would the Prophet Muhammad (saw) say about those who lie and provide false excuses to Him?
 Narrated `Abdullah bin Ka`b:                     I heard Ka`b bin Malik who was one of the three who were forgiven, saying that he had never remained behind Allah's Apostle in any Ghazwa which he had fought except two Ghazwat Ghazwat- Al-`Usra (Tabuk) and Ghazwat-Badr. He added. "I decided to tell the truth to Allah's Apostle in the forenoon, and scarcely did he return from a journey he made, except in the forenoon, he would go first to the mosque and offer a two-rak`at prayer. The Prophet forbade others to speak to me or to my two companions, but he did not prohibit speaking to any of those who had remained behind excepting us. So the people avoided speaking to us, and I stayed in that state till I could no longer bear it, and the only thing that worried me was that I might die and the Prophet would not offer the funeral prayer for me, or Allah's Apostle might die and I would be left in that social status among the people that nobody would speak to me or offer the funeral prayer for me. But Allah revealed His Forgiveness for us to the Prophet in the last third of the night while Allah's Apostle was with Um Salama. Um Salama sympathized with me and helped me in my disaster. Allah's Apostle said, 'O Um Salama! Ka`b has been forgiven!' She said, 'Shall I send someone to him to give him the good tidings?' He said, 'If you did so, the people would not let you sleep the rest of the night.' So when the Prophet had offered the Fajr prayer, he announced Allah's Forgiveness for us. His face used to look as bright as a piece of the (full) moon whenever he was pleased. When Allah revealed His Forgiveness for us, we were the three whose case had been deferred while the excuse presented by those who had apologized had been accepted. But when there were mentioned those who had told the Prophet lies and remained behind (the battle of Tabuk) and had given false excuses, they were described with the worse description one may be described with. Allah said: 'They will present their excuses to you (Muslims) when you return to them. Say: Present no excuses; we shall not believe you. Allah has already informed us of the true state of matters concerning you. Allah and His Apostle will observe your actions." (9.94)