Do Not Vow Hardship on Yourself
Ibn Abbas (radi Allahu anhum) reported: While the Prophet (sal Allahu alaihi wa sallam) was delivering Khutbah, he noticed a man who was standing, so he asked about him and was told that he was Abu Israel who had taken a vow to remain standing and not sit, or go into the shade, or speak while observing fasting. Thereupon the Messenger of Allah (sal Allahu alaihi wa sallam) said, “Tell him to speak, to go into the shade, to sit and to complete his fast.”
1. This Hadith makes it abundantly clear that one cannot attain the Pleasure of Allah by means of self-invented methods. It can only be achieved by ways and means prescribed in the Qur’an and Sunnah.
2. One should never vow for anything which is smeared with sin or which is not permitted by Deen. An instance of this is quoted in the above mentioned Hadith.
3. The majority of scholars who do not think the expiation of such vows necessary, quote this Hadith in support of their view. They argue that the Prophet (sal Allahu alaihi wa sallam) has not prescribed expiation in such cases as is evident from this Hadith.
And Allah Knows Best!