How to Prove or disapprove the following proposition?

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Prove or disapprove:

Let ‎$‎f‎$‎ be a integral real function such that ‎$‎\sum_{k=1}^\infty f(k)‎$ ‎is ‎convergent‎. Then, ‎$‎\sum_{k=1}^\infty\int_{a}^{b} f(k+x)‎dx$ ‎is ‎convergent ‎for ‎every ‎‎$‎x\geq 0‎$‎.