During a conference [four] years ago, we came across the statement of Shaikh Saleh Al-Ash-Shaikh (hafidhahullaah), who said:
“Our fasting should have an impact on our limbs.
Jabir ibn Abdullaah (radiallaahu ‘anhu) said:
When you fast, your hearing has to fast, your sight has to fast, your tongue has to fast. …And do not make your fasting day like your normal day.
This is the complete fast.”
653. Narrated ‘Abdullaah bin ‘Umar (radhi Allaahu anhu) : Allaah’s Messenger (Sallallaahu Alaihi Wasallam) mentioned
Ramadaan and said,
Do not observe Saum (fast) unless you see the crescent (of Ramadaan), and do not give up Saum till you see the crescent (of Shawwaal), and if the sky is overcast (if you cannot see the crescent), then act on estimation (i.e. count Sha’baan as thirty days).
[Saheeh Al-Bukhaari, Hadeeth No. 130, Vol. 3]
Source : The Book Of As-Siyaam (the fasting) – Chapter 2 – It is obligatory to start fasting in Ramadaan with the sighting of new moon and to finish with the sighting of new moon. If the weather is cloudy at the beginning or at the end, then complete thirty days as the period of the month. Al-Lulu Wal-Marjan, Compiled by : Fuwad Abdul-Baqi, Translated by : Dr. Muhammad Muhsin Khan
657. Narrated Aboo Huraira (radhi Allaahu anhu) : The Prophet (Sallallaahu Alaihi Wasallam) said,
None of you should observe Saum (fast) for a day or two ahead of Ramadaan, unless he has the habit of observing Saum (Nawaafil), (and if his Saum coincides with that day) then he can observe Saum that day.
[Saheeh Al-Bukhaari, Hadeeth No. 138, Vol. 3]
Source : The Book Of As-Siyaam (the fasting) – Chapter 3 – Not to Observe Saum for a day or two ahead of Ramadaan. Al-Lulu Wal-Marjan, Compiled by : Fuwad Abdul-Baqi, Translated by : Dr. Muhammad Muhsin Khan
Do not anticipate Ramadan by fasting one or two days before it – alifta.net