פירוש על בבא מציעא 5:1

And it can be said it all [belongs] to one: Moreover, per force, it is all [this] one's or all [that] one's. [Yet] in spite of this, we divide it without an oath.

Here, where there is no financial association: Moreover, it can be said that both of them picked it up together.

Is it not all the more so: That we divide it without an oath.