This text comes from The Poetical Works of Robert Burns, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
'Tis Friendship's pledge, my young, fair friend,
Nor thou the gift refuse,
Nor with unwilling ear attend
The moralizing muse
Since thou, in all thy youth and charms,
Must bid the world adieu,
(A world 'gainst peace in constant arms)
To join the friendly few.
Since, thy gay morn of life o'ercast,
Chill came the tempest's lower,
(And ne'er misfortune's eastern blast
Did nip a fairer flower.)
Since life's gay scenes must charm no more,
Still much is left behind;
Still nobler wealth hast thou in store—
The comforts of the mind!
Thine is the self-approving glow,
On conscious honour's part;
And, dearest gift of heaven below,
Thine friendship's truest heart.
The joys refin'd of sense and taste,
With every muse to rove:
And doubly were the poet blest,
These joys could he improve.