Ie ni areba ke ni moru ii o kusamakura tabi ni shi areba shii no ha ni moru

家にあれば笥に盛る飯を草枕
旅にしあれば椎の葉に盛る

Roma-ji: Ie ni areba ke ni moru ii o kusamakura tabi ni shi areba shii no ha ni moru
English Translation: Were I at my home,
I would heap my rice in a bowl;
grass for my pillow,
since I am out on a journey,
I heap it on oak leaves.
Meaning: At home I would serve my rice in a bowl, but now that I am on a journey, I serve it on the leaves of the shii oak.
Commentary: Book Two Elegies 142

Headnote continued from the preceding poem: "Two poems by Prince Arima, grieving over himself, when he tied together the branches of a pine"
At home he would heap his rice in a bowl, but as a traveler he heaps it on oak leaves; in plain words he conveys the hardship and loneliness of a captive's journey. Some take the rice to be an offering to the god of the road.
This is the second of the two poems Prince Arima composed at Iwashiro, and its authorship follows the headnote of the pair. A left note explains that although these poems were not composed at the time of drawing the coffin, they are placed among the elegies in accordance with their spirit.
The author, Prince Arima, was a son of Emperor Kōtoku. In the reign of Empress Saimei he was said to have plotted rebellion at the instigation of Soga no Akae, and he was executed at the age of nineteen by the traditional count.

In the first line, "ie ni areba," ba marks a condition: when I am at home. It pairs with "tabi ni shi areba" in the fourth line.
In the second line, "ke ni moru ii o," ke is a bowl for serving rice.
The third line, "kusamakura," "grass pillow," is a pillow word for tabi, "journey."
In the fourth line, "tabi ni shi areba," shi is an intensifying particle: since I am on a journey.
The final line, "shii no ha ni moru," repeats moru from the second line, closing on the contrast of bowl and leaf, home and journey.
Author: Prince Arima
Source: Manyoshu
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