God says
And perform the pilgrimage [Haj] and the pious visit [Umrah to Mecca] in the Honour of God …. Q.2:196
Hence pilgrimage to the House [of worship] is a duty owed to God by all people who are able to undertake it…. Q.3:97
Prophet said
Ibn Omar reported that a man came to the Prophet and asked: What makes the pilgrimage compulsory? He replied, “means and conveyance” -- H: Tirmizi and Ibn Majah.
‘Hasten to perform pilgrimage which is obligatory, for none among you will know what will happen (tomorrow)’ -- H: Ahmed. N: Ibn Abbas.
Ibn Abbas reported that a women of Khashama (tribe) came to the Prophet and enquired whether she could do Pilgrimage on behalf of her father who was (too weak) and old to even sit on a conveyance. The Prophet replied “Yes” -- Bukhari and Muslim.
‘He who came intentionally to visit my grave will sit in my neighborhood on the day of Resurrection’ - Shu’ab Al-Iman
‘No woman shall make a journey to the destination of one day and night except with a “Mahram” (i.e., with whom marriage is prohibited in Islam)’ – H: Bukhari and Muslim