All moneys actually in the treasury to the credit of the fund from which they are to be drawn, and all moneys applicable to the payment of the obligation or appropriation involved, that are anticipated to come into the treasury before maturity of such contract, agreement, or obligation, from taxes or assessments, or from sales of services, products, or by-products, or from any City undertakings, fees, charges, accounts and bills receivable or other credits in process of collection; and all moneys applicable to the payment of such obligation or appropriation, which are to be paid into the treasury prior to the maturity thereof, arising from the sale or lease of lands or other property, and moneys to be derived from lawfully authorized bonds sold and in process of delivery shall, for the purposes of such certificate, be deemed in the treasury to the credit of the appropriate fund and subject to such certification.