The Church of Scotland's moderator John Chalmers called for Scots to "live in harmony with one another" whatever the result and hailed the feverish run-up to Thursday's vote as "a wonderful democratic concerto".
"All of those who will vote 'Yes' and all of those who will vote 'No' need to remember that we belong together in the same Scotland," he told worshippers at St Mary's Episcopal Church in Edinburgh in a sermon broadcast on BBC radio nationwide.
The pro-union camp has been far ahead in the polls for many months, but the difference has narrowed in recent weeks and a raft of surveys over the weekend indicated that Thursday's vote could go either way.
A Survation poll yesterday showed the "No" camp at 47 per cent and the "Yes" at 40.8 per cent, with 9.0 per cent undecided and 3.2 per cent unwilling to say.
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An ICM online poll for the Sunday Telegraph placed the pro-independence campaign at 49 per cent and the pro-UK at 42 per cent with 9.0 per cent undecided, but a senior pollster warned the sample size was too small.
"The polls show that the referendum is on a knife-edge. There is everything to play for," said Blair Jenkins, chief executive of the "Yes Scotland" campaign.
Both sides are scrambling to win over the undecided voters who could hold the balance in the vote.
The "Better Together" campaign has warned of a possible negative economic impact of a pro-independence vote.
The pound has fallen on the financial markets as the polls have narrowed and the shares of Scottish businesses have also lost value on the stock exchange.
Britain's main political parties have promised to grant Scotland more powers in the event of a "No" vote, arguing this would be the best of both worlds for Scots.