How to change font of bibliography with no extra text appeared before it?

Question

I want to change font of bibliography (using package natbib). I found some solutions here. They worked for me, but the text size (e.g.: \small or 10pt) started to appear as text before bibliography. I want to get rid this text off. Solution 1:

{\footnotesize small
\bibliography{references}}

Solution 2:

\def\bibfont{\footnotesize 10pt}

Minimal code:

\documentclass[a4paper,12pt, english]{article}

\usepackage{natbib}
\bibliographystyle{abbrvnat}
\setcitestyle{authoryear,open={(},close={)}}

\usepackage[nottoc]{tocbibind}

\begin{document}
\tableofcontents
\newpage
\section{Intoduction}
\citep{Moran2008}.
{\footnotesize small
\bibliography{references}}
\end{document}

Part of output file:

1 Intoduction

(Moran et al., 2008). small

Bibliography