وَأَمَّا أَنْتَ فَمَتَى صُمْتَ فَادْهُنْ رَأْسَكَ وَاغْسِلْ وَجْهَكَ،
لِكَيْ لاَ تَظْهَرَ لِلنَّاسِ صَائِمًا، بَلْ لأَبِيكَ الَّذِي فِي الْخَفَاءِ.
فَأَبُوكَ الَّذِي يَرَى فِي الْخَفَاءِ يُجَازِيكَ عَلاَنِيَةً.
(متى٦ :١٧ -١٨ )

But when you fast, put oil on your head and wash your face, so that it will not be obvious to men that you are fasting, but only to your Father, who is unseen; and your Father, who sees what is done in secret, will reward you.

(Matthew 6:17-18, NIV)