Making False Excuses for Oneself
Imām Ibn Taimiyyah, may Allāh have mercy on him, said:
From the usual practices of hypocrites is arguing on behalf of themselves with lies and false oaths; Allāh describes them as that in [more] than one place […].
So making excuses for oneself falsely and arguing on behalf of oneself [without right] are not allowed [in Islam].
Majmūʿ Al-Fatāwá, vol. 14, pp. 446-47.