What is the biblical basis for All Saint's Day? As an Evangelical Christian, I recently had a debate about why I do not celebrate Halloween. Their response was that the origins of Halloween come from the Christian "All Saint's Day" (which is actually the day after Halloween).

I would like to know if there is any mention of All Saint's Day in the bible, and if not, is there any biblical basis for the tradition of All Saint's Day in the bible?
No, there are not references to All Saints Day in the Bible.

The tradition of All Saints Day originated long after the books of the Bible were written.

From Catholic Online


  The origin of the festival of All Saints celebrated in the West dates
  to May 13, 609 or 610, when Pope Boniface IV consecrated the Pantheon
  at Rome to the Blessed Virgin and all the martyrs; the feast of the
  dedicatio Sanctae Mariae ad Martyres has been celebrated at Rome ever
  since. There is evidence that from the fifth through the seventh
  centuries there existed in certain places and at sporadic intervals a
  feast date 13 May to celebrate the holy martyrs.[4] The origin of All
  Saints' Day cannot be traced with certainty, and it has been observed
  on various days in different places. However, there are some who
  maintain the belief that it has origins in the pagan observation of 13
  May, the Feast of the Lemures, in which the malevolent and restless
  spirits of the dead were propitiated. Liturgiologists base the idea
  that this Lemuria festival was the origin of that of All Saints on
  their identical dates and on the similar theme of "all the dead".[5]
  
  The feast of All Saints, on its current date, is traced to the
  foundation by Pope Gregory III (731.741) of an oratory in St. Peter's
  for the relics "of the holy apostles and of all saints, martyrs and
  confessors, of all the just made perfect who are at rest throughout
  the world", with the day moved to 1 November and the 13 May feast
  suppressed.[6]