RUBAIYAT AND RUBAIYAT STANZA
A Rubaiyat is a poem using Rubaiyat stanzas. The Rubaiyat stanza is a quatrain (4-line stanza) written in iambic pentameter. The rhyme scheme is a-a-b-a. This form is also called the "Omar stanza."
Ideally, if the poem contains more than one such stanza, the third lines in all should rhyme.
The examples below from Omar Khayyam were found on the internet.
Come, fill the Cup, and in the fire of Spring
The Winter garment of Repentance fling;
The Bird of Time has but a little way
To fly - and Lo! the Bird is on the Wing.
[Stanza 7, 1st edition]
A Book of Verses underneath the Bough,
A Jug of Wine, a Loaf of Bread -- and Thou
Beside me singing in the Wilderness --
Oh, Wilderness were Paradise enow!