The lajnah stated that “Cutting hair or clipping nails out of forgetfulness or ignorance has no consequences because Allah (Glorified be He) says:

Our Lord! Punish us not if we forget or fall into error

[2:286]

It was authentically reported that the Prophet (peace be upon him) said about the Tafsir (explanation/exegesis of the meanings of the Qur’an) of this Ayah (Qur’anic verse) that  Allah said: ‘I did.’ 

[Reference]