§ 101. Contents of petition. The petition must be in writing; it must be signed by the insolvent, and specify his residence, and also, if he is in prison, the county in which he is imprisoned, and the cause of his imprisonment. It must set forth, in substance, that he is unable to pay all his debts in full; that he is willing to assign his property for the benefit of all his creditors, and in all other respects to comply with the provisions of this article, for the purpose of being exempted from arrest and imprisonment, as prescribed therein; and it must pray, that upon his so doing, he may thereafter be exempted from arrest, by reason of a debt, arising upon a contract previously made; and also, if he is imprisoned, that he may be discharged from his imprisonment. It must be verified by the affidavit of the insolvent, annexed thereto, taken on the day of the presentation thereof, to the effect, that the petition is in all respects true in matter of fact.