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.