To apply the property of negative integer exponents, we use the rule that states:
\[ a^{-n} = \frac{1}{a^n} \]
For \(7^{-3}\), we can rewrite it as:
\[ 7^{-3} = \frac{1}{7^3} \]
Next, we need to calculate \(7^3\):
\[ 7^3 = 7 \times 7 \times 7 = 49 \times 7 = 343 \]
Now substituting back, we have:
\[ 7^{-3} = \frac{1}{7^3} = \frac{1}{343} \]
Thus, the value of \(7\) to the negative third power is:
\[ \boxed{\frac{1}{343}} \]