أَيَّامًا مَّعْدُودَٰتٍ ۚ فَمَن كَانَ مِنكُم مَّرِيضًا أَوْ عَلَىٰ سَفَرٍ فَعِدَّةٌ مِّنْ أَيَّامٍ أُخَرَ ۚ وَعَلَى ٱلَّذِينَ يُطِيقُونَهُۥ فِدْيَةٌ طَعَامُ مِسْكِينٍ ۖ فَمَن تَطَوَّعَ خَيْرًا فَهُوَ خَيْرٌ لَّهُۥ ۚ وَأَن تَصُومُوا۟ خَيْرٌ لَّكُمْ ۖ إِن كُنتُمْ تَعْلَمُونَ
[Fasting for] a limited number of days. So whoever among you is ill or on a journey [during them] – then an equal number of days [are to be made up]. And upon those who are able [to fast, but with hardship] – a ransom [as substitute] of feeding a poor person [each day]. And whoever volunteers excess – it is better for him. But to fast is best for you, if you only knew.
Surah Baqarah Ayat 184

Hz. Talha ibn Ubayd ^Rz reported: Whenever the Messenger of Allah ^PBUH, saw the crescent moon, he would say:
اللَّهُمَّ أَهْلِلْهُ عَلَيْنَا بِالْيُمْنِ وَالْإِيمَانِ وَالسَّلَامَةِ وَالْإِسْلَامِ رَبِّي وَرَبُّكَ اللَّهُ
O Allah, bring it over us with blessings and faith, safety and Islam. My Lord and your Lord is Allah.
Source: Sunan al-Tirmidhī 345

Hazrath Imam Mahdi ^PBUH is narrated to have said that-” The nature of some of the aulia (saints or freinds of Allah) is like that of the scorpions and snakes, because if someone tries to hurt or trouble them, they immediately bite such people.Some saints were such that they would curse those that troubled them.But the apostles and perfect saints were like the fish. When somebody troubles the fish . it moves away and does not trouble the person who troubles it.Similarly the apostles and perfect saints endure the trouble.They even forgive and seek the salvation of those of those who trouble them.”

Ameer-Ul-Muminin Hazrath Ali -ul Murtuza ^Rz. ne farmaya ke-“Laakhon ko dost banana koi badi baat nahi,badi baat to yeh hai ke aisa dost banaao jo tab tumhara saath de jab laakhon tumhare mukhalif hon.”